Add just-the-docs Gem.

Remove all the old just-the-docs components, and replace with a
dependency on the just-the-docs Ruby Gem (v0.10).
There is an outstanding issue with the flip cards on the home page, due
to modifications to JTD's scss which enabled this.

_includes/icons/code_copy.html

-<!-- Bootstrap Icons. MIT License: https://github.com/twbs/icons/blob/main/LICENSE.md -->
-<symbol id="svg-copy" viewBox="0 0 16 16">
-  <title>Copy</title>
-  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard" viewBox="0 0 16 16">
-    <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
-    <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
-  </svg>
-</symbol>
-<symbol id="svg-copied" viewBox="0 0 16 16">
-  <title>Copied</title>
-  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard-check-fill" viewBox="0 0 16 16">
-    <path d="M6.5 0A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3Zm3 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3Z"/>
-    <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1A2.5 2.5 0 0 1 9.5 5h-3A2.5 2.5 0 0 1 4 2.5v-1Zm6.854 7.354-3 3a.5.5 0 0 1-.708 0l-1.5-1.5a.5.5 0 0 1 .708-.708L7.5 10.793l2.646-2.647a.5.5 0 0 1 .708.708Z"/>
-  </svg>
-</symbol>

_includes/icons/document.html

-<symbol id="svg-doc" viewBox="0 0 24 24">
-  <title>Document</title>
-  <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file">
-    <path d="M13 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V9z"></path><polyline points="13 2 13 9 20 9"></polyline>
-  </svg>
-</symbol>

_includes/icons/expand.html

-<symbol id="svg-arrow-right" viewBox="0 0 24 24">
-  <title>Expand</title>
-  <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-chevron-right">
-    <polyline points="9 18 15 12 9 6"></polyline>
-  </svg>
-</symbol>

_includes/icons/external_link.html

-<!-- Feather. MIT License: https://github.com/feathericons/feather/blob/master/LICENSE -->
-<symbol id="svg-external-link" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-external-link">
-  <title id="svg-external-link-title">(external link)</title>
-  <path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path><polyline points="15 3 21 3 21 9"></polyline><line x1="10" y1="14" x2="21" y2="3"></line>
-</symbol>

_includes/icons/icons.html

-<svg xmlns="http://www.w3.org/2000/svg" class="d-none">
-  {% include icons/link.html %}
-  {% include icons/menu.html %}
-  {% include icons/expand.html %}
-  {% include icons/external_link.html %}
-  {% if site.search_enabled != false %}
-    {% include icons/document.html %}
-    {% include icons/search.html %}
-  {% endif %}
-  {% if site.enable_copy_code_button != false %}
-    {% include icons/code_copy.html %}
-  {% endif %}
-</svg>

_includes/icons/link.html

-<symbol id="svg-link" viewBox="0 0 24 24">
-  <title>Link</title>
-  <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-link">
-    <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path>
-  </svg>
-</symbol>

_includes/icons/menu.html

-<symbol id="svg-menu" viewBox="0 0 24 24">
-  <title>Menu</title>
-  <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-menu">
-    <line x1="3" y1="12" x2="21" y2="12"></line><line x1="3" y1="6" x2="21" y2="6"></line><line x1="3" y1="18" x2="21" y2="18"></line>
-  </svg>
-</symbol>

_includes/icons/search.html

-<symbol id="svg-search" viewBox="0 0 24 24">
-  <title>Search</title>
-  <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-search">
-    <circle cx="11" cy="11" r="8"></circle><line x1="21" y1="21" x2="16.65" y2="16.65"></line>
-  </svg>
-</symbol>

_includes/mermaid_config.js

-{}

_includes/nav.html

-{%- comment -%}
-  The `nav_order` values of pages affect the order in which they are shown in
-  the navigation panel and in the automatically generated tables of contents.
-  Sibling pages with the same `nav_order` value may be shown in any order.
-  Sibling pages with no `nav_order` value are shown after all pages that have
-  explicit `nav_order` values, ordered by their `title` values.
-  
-  The `nav_order` and `title` values can be numbers or strings. To avoid build
-  failures, we sort numbers and strings separately. We sort numbers by their
-  values, and strings lexicographically. The case-sensitivity of string sorting
-  is determined by the configuration setting of `nav_sort`. Pages with no `title`
-  value are excluded from the navigation.
-
-  Note: Numbers used as `title` or `nav_order` values should not be in quotes,
-  unless you intend them to be lexicographically ordered. Numbers are written
-  without spaces or thousands-separators. Negative numbers are preceded by `-`.
-  Floats are written with the integral and fractional parts separated by `.`.
-  (Bounds on the magnitude and precision are presumably the same as in Liquid.)
-{%- endcomment -%}
-
-{%- assign title_pages = include.pages
-      | where_exp: "item", "item.title != nil" -%}
-
-{%- comment -%}
-  A page with `nav_exclude: true` does not appear in the main navigation.
-  If it has a `parent`, it may appear in the parent's table of contents.
-  If it specifies `has_children: true`, it should appear in the breadcrumbs
-  of the child pages, but its order in relation to other pages is irrelevant.
-  Pages that never appear can be removed from the pages that need to be sorted.
-  This optimisation can be significant on a site with many pages.
-  
-  In Jekyll 4, the pages to be sorted can be filtered by:
-  
-  {%- assign title_pages = title_pages
-        | where_exp: "item", "item.nav_exclude != true or item.parent != nil" -%}
-  
-  That filter is not allowed in Jekyll 3. The following iterative code gives the
-  same effect, but it is activated only when it will filter more than 50% of the
-  pages.
-{%- endcomment -%}
-
-{%- unless title_pages == empty -%}
-  {%- assign unsorted_pages = title_pages
-        | where_exp: "item", "item.parent == nil" 
-        | where_exp: "item", "item.nav_exclude == true" -%}
-  {%- assign title_pages_size = title_pages.size -%}
-  {%- assign unsorted_pages_percent = unsorted_pages.size
-        | times: 100 | divided_by: title_pages_size -%}
-  {%- if unsorted_pages_percent > 50 -%}
-    {%- assign sorted_pages = "" | split: "" -%}
-    {%- for item in title_pages -%}
-      {%- if item.nav_exclude != true or item.parent -%}
-        {%- assign sorted_pages = sorted_pages | push: item -%}
-      {%- endif -%}
-    {%- endfor -%}
-    {%- assign title_pages = sorted_pages -%}
-  {%- endif -%}
-{%- endunless -%}
-
-{%- assign nav_order_pages = title_pages
-      | where_exp: "item", "item.nav_order != nil" -%}
-{%- assign title_order_pages = title_pages
-      | where_exp: "item", "item.nav_order == nil" -%}
-
-{%- comment -%}
-  Divide the arrays of `nav_order_pages` and `title_order_pages` according to
-  the type of value.
-  
-  The first character of the result of `jsonify` is `"` only for strings.
-  Grouping by a single character also ensures the number of groups is small.
-{%- endcomment -%}
-
-{%- assign nav_number_pages = "" | split: "" -%}
-{%- assign nav_string_pages = "" | split: "" -%}
-{%- assign nav_order_groups = nav_order_pages
-      | group_by_exp: "item", "item.nav_order | jsonify | slice: 0" -%}
-{%- for group in nav_order_groups -%}
-  {%- if group.name == '"' -%}
-    {%- assign nav_string_pages = group.items -%}
-  {%- else -%}
-    {%- assign nav_number_pages = nav_number_pages | concat: group.items -%}
-  {%- endif -%}
-{%- endfor -%}
-
-{%- unless nav_number_pages == empty -%}
-  {%- assign nav_number_pages = nav_number_pages | sort: "nav_order" -%}
-{%- endunless -%}
-
-{%- unless nav_string_pages == empty -%}
-  {%- if site.nav_sort == 'case_insensitive' -%}
-    {%- assign nav_string_pages = nav_string_pages | sort_natural: "nav_order" -%}
-  {%- else -%}
-    {%- assign nav_string_pages = nav_string_pages | sort: "nav_order" -%}
-  {%- endif -%}
-{%- endunless -%}
-
-{%- assign title_number_pages = "" | split: "" -%}
-{%- assign title_string_pages = "" | split: "" -%}
-{%- assign title_order_groups = title_order_pages
-      | group_by_exp: "item", "item.title | jsonify | slice: 0" -%}
-{%- for group in title_order_groups -%}
-  {%- if group.name == '"' -%}
-    {%- assign title_string_pages = group.items -%}
-  {%- else -%}
-    {%- assign title_number_pages = title_number_pages | concat: group.items -%}
-  {%- endif -%}
-{%- endfor -%}
-
-{%- unless title_number_pages == empty -%}
-  {%- assign title_number_pages = title_number_pages | sort: "title" -%}
-{%- endunless -%}
-
-{%- unless title_string_pages == empty -%}
-  {%- if site.nav_sort == 'case_insensitive' -%}
-    {%- assign title_string_pages = title_string_pages | sort_natural: "title" -%}
-  {%- else -%}
-    {%- assign title_string_pages = title_string_pages | sort: "title" -%}
-  {%- endif -%}
-{%- endunless -%}
-
-{%- assign pages_list = nav_number_pages | concat: nav_string_pages
-      | concat: title_number_pages | concat: title_string_pages -%}
-
-{%- assign first_level_pages = pages_list
-      | where_exp: "item", "item.parent == nil" -%}
-{%- assign second_level_pages = pages_list
-      | where_exp: "item", "item.parent != nil"
-      | where_exp: "item", "item.grand_parent == nil" -%}
-{%- assign third_level_pages = pages_list
-      | where_exp: "item", "item.grand_parent != nil" -%}
-
-{%- comment -%}
-  The order of sibling pages in `pages_list` determines the order of display of
-  links to them in lists of navigation links and in auto-generated TOCs.
-  
-  Note that Liquid evaluates conditions from right to left (and it does not allow
-  the use of parentheses). Some conditions are not so easy to express clearly...
-  
-  For example, consider the following condition:
-  
-    C: page.collection = = include.key and 
-       page.url = = node.url or 
-       page.grand_parent = = node.title or 
-       page.parent = = node.title and 
-       page.grand_parent = = nil
- 
-  Here, `node` is a first-level page. The last part of the condition
-  -- namely: `page.parent = = node.title and page.grand_parent = = nil` --
-  is evaluated first; it holds if and only if `page` is a child of `node`.
-  
-  The condition `page.grand_parent = = node.title or ...` holds when 
-  `page` is a grandchild of node, OR `...` holds.
-  
-  The condition `page.url = = node.url or ...` holds when 
-  `page` is `node`, OR `...` holds.
-  
-  The condition C: `page.collection = = include.key and ...` holds when we are 
-  generating the nav links for a collection that includes `page`, AND `...` holds.
-{%- endcomment -%}
-
-<ul class="nav-list">
-{%- for node in first_level_pages -%}
-    {%- unless node.nav_exclude -%}
-      <li class="nav-list-item{% if page.collection == include.key and page.url == node.url or page.grand_parent == node.title or page.parent == node.title and page.grand_parent == nil %} active{% endif %}">
-        {%- if node.has_children -%}
-          <a href="#" class="nav-list-expander" aria-label="toggle links in {{ node.title }} category">
-            <svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg>
-          </a>
-        {%- endif -%}
-        <a href="{{ node.url | relative_url }}" class="nav-list-link{% if page.url == node.url %} active{% endif %}">{{ node.title }}</a>
-        {%- if node.has_children -%}
-          {%- assign children_list = second_level_pages
-                | where: "parent", node.title -%}
-          {%- if node.child_nav_order == 'desc' or node.child_nav_order == 'reversed' -%}
-            {%- assign children_list = children_list | reverse -%}
-          {%- endif -%}
-          <ul class="nav-list">
-          {%- for child in children_list -%}
-            {%- unless child.nav_exclude -%}
-            <li class="nav-list-item {% if page.url == child.url or page.parent == child.title %} active{% endif %}">
-              {%- if child.has_children -%}
-                <a href="#" class="nav-list-expander" aria-label="toggle links in {{ child.title }} category">
-                  <svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg>
-                </a>
-              {%- endif -%}
-              <a href="{{ child.url | relative_url }}" class="nav-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
-              {%- if child.has_children -%}
-                {%- assign grand_children_list = third_level_pages
-                      | where: "parent", child.title
-                      | where: "grand_parent", node.title -%}
-                {%- if child.child_nav_order == 'desc' or child.child_nav_order == 'reversed' -%}
-                  {%- assign grand_children_list = grand_children_list | reverse -%}
-                {%- endif -%}
-                <ul class="nav-list">
-                {%- for grand_child in grand_children_list -%}
-                  {%- unless grand_child.nav_exclude -%}
-                  <li class="nav-list-item {% if page.url == grand_child.url %} active{% endif %}">
-                    <a href="{{ grand_child.url | relative_url }}" class="nav-list-link{% if page.url == grand_child.url %} active{% endif %}">{{ grand_child.title }}</a>
-                  </li>
-                  {%- endunless -%}
-                {%- endfor -%}
-                </ul>
-              {%- endif -%}
-            </li>
-            {%- endunless -%}
-          {%- endfor -%}
-          </ul>
-        {%- endif -%}
-      </li>
-    {%- endunless -%}
-{%- endfor -%}
-</ul>
-
-{%- comment -%}
-  `page.collection` is the name of the Jekyll collection that contains the page,
-  if any, and otherwise nil. Similarly for `include.key`.
-  
-  If the current page is in the collection (if any) whose navigation is currently
-  being generated, the following code sets `first_level_url` to the URL used in
-  the page's top-level breadcrumb (if any), and `second_level_url` to that used
-  in the page's second-level breadcrumb (if any).
-  
-  For pages with children, the code also sets `toc_list` to the list of child pages,
-  reversing the order if needed.
-{%- endcomment -%}
-
-{%- if page.collection == include.key -%}
-  {%- for node in first_level_pages -%}
-      {%- if page.grand_parent == node.title or page.parent == node.title and page.grand_parent == nil -%}
-        {%- assign first_level_url = node.url | relative_url -%}
-      {%- endif -%}
-      {%- if node.has_children -%}
-        {%- assign children_list = second_level_pages | where: "parent", node.title -%}
-        {%- for child in children_list -%}
-          {%- if child.has_children -%}
-            {%- if page.url == child.url or page.parent == child.title and page.grand_parent == child.parent -%}
-              {%- assign second_level_url = child.url | relative_url -%}
-            {%- endif -%}
-          {%- endif -%}
-        {%- endfor -%}
-      {%- endif -%}
-  {%- endfor -%}
-  {%- if page.has_children == true and page.has_toc != false -%}
-    {%- assign toc_list = pages_list
-          | where: "parent", page.title
-          | where_exp: "item", "item.grand_parent == page.parent" -%}
-    {%- if page.child_nav_order == 'desc' or page.child_nav_order == 'reversed' -%}
-      {%- assign toc_list = toc_list | reverse -%}
-    {%- endif -%}
-  {%- endif -%}
-{%- endif -%}

_includes/search_placeholder_custom.html

-Search {{site.title}}

_includes/title.html

-{% if site.logo %}
-  <div class="site-logo"></div>
-{% else %}
-  {{ site.title }}
-{% endif %}

_includes/toc_heading_custom.html

-<h2 class="text-delta">Table of contents</h2>

_includes/vendor/anchor_headings.html

-{% capture headingsWorkspace %}
-  {% comment %}
-    Copyright (c) 2018 Vladimir "allejo" Jimenez
-
-    Permission is hereby granted, free of charge, to any person
-    obtaining a copy of this software and associated documentation
-    files (the "Software"), to deal in the Software without
-    restriction, including without limitation the rights to use,
-    copy, modify, merge, publish, distribute, sublicense, and/or sell
-    copies of the Software, and to permit persons to whom the
-    Software is furnished to do so, subject to the following
-    conditions:
-
-    The above copyright notice and this permission notice shall be
-    included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
-    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
-    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-    OTHER DEALINGS IN THE SOFTWARE.
-  {% endcomment %}
-  {% comment %}
-    Version 1.0.12
-      https://github.com/allejo/jekyll-anchor-headings
-
-    "Be the pull request you wish to see in the world." ~Ben Balter
-
-    Usage:
-      {% include anchor_headings.html html=content anchorBody="#" %}
-
-    Parameters:
-      * html          (string) - the HTML of compiled markdown generated by kramdown in Jekyll
-
-    Optional Parameters:
-      * beforeHeading (bool)   : false  - Set to true if the anchor should be placed _before_ the heading's content
-      * headerAttrs   (string) :  ''    - Any custom HTML attributes that will be added to the heading tag; you may NOT use `id`;
-                                          the `%heading%` and `%html_id%` placeholders are available
-      * anchorAttrs   (string) :  ''    - Any custom HTML attributes that will be added to the `<a>` tag; you may NOT use `href`, `class` or `title`;
-                                          the `%heading%` and `%html_id%` placeholders are available
-      * anchorBody    (string) :  ''    - The content that will be placed inside the anchor; the `%heading%` placeholder is available
-      * anchorClass   (string) :  ''    - The class(es) that will be used for each anchor. Separate multiple classes with a space
-      * anchorTitle   (string) :  ''    - The `title` attribute that will be used for anchors
-      * h_min         (int)    :  1     - The minimum header level to build an anchor for; any header lower than this value will be ignored
-      * h_max         (int)    :  6     - The maximum header level to build an anchor for; any header greater than this value will be ignored
-      * bodyPrefix    (string) :  ''    - Anything that should be inserted inside of the heading tag _before_ its anchor and content
-      * bodySuffix    (string) :  ''    - Anything that should be inserted inside of the heading tag _after_ its anchor and content
-      * generateId    (true)   :  false - Set to true if a header without id should generate an id to use.
-
-    Output:
-      The original HTML with the addition of anchors inside of all of the h1-h6 headings.
-  {% endcomment %}
-
-  {% assign minHeader = include.h_min | default: 1 %}
-  {% assign maxHeader = include.h_max | default: 6 %}
-  {% assign beforeHeading = include.beforeHeading %}
-  {% assign headerAttrs = include.headerAttrs %}
-  {% assign nodes = include.html | split: '<h' %}
-
-  {% capture edited_headings %}{% endcapture %}
-
-  {% for _node in nodes %}
-    {% capture node %}{{ _node | strip }}{% endcapture %}
-
-    {% if node == "" %}
-      {% continue %}
-    {% endif %}
-
-    {% assign nextChar = node | replace: '"', '' | strip | slice: 0, 1 %}
-    {% assign headerLevel = nextChar | times: 1 %}
-
-    <!-- If the level is cast to 0, it means it's not a h1-h6 tag, so let's see if we need to fix it -->
-    {% if headerLevel == 0 %}
-      <!-- Split up the node based on closing angle brackets and get the first one. -->
-      {% assign firstChunk = node | split: '>' | first %}
-
-      <!-- If the first chunk does NOT contain a '<', that means we've broken another HTML tag that starts with 'h' -->
-      {% unless firstChunk contains '<' %}
-        {% capture node %}<h{{ node }}{% endcapture %}
-      {% endunless %}
-
-      {% capture edited_headings %}{{ edited_headings }}{{ node }}{% endcapture %}
-      {% continue %}
-    {% endif %}
-
-    {% capture _closingTag %}</h{{ headerLevel }}>{% endcapture %}
-    {% assign _workspace = node | split: _closingTag %}
-    {% capture _hAttrToStrip %}{{ _workspace[0] | split: '>' | first }}>{% endcapture %}
-    {% assign header = _workspace[0] | replace: _hAttrToStrip, '' %}
-    {% assign escaped_header = header | strip_html | strip %}
-
-    {% assign _classWorkspace = _workspace[0] | split: 'class="' %}
-    {% assign _classWorkspace = _classWorkspace[1] | split: '"' %}
-    {% assign _html_class = _classWorkspace[0] %}
-
-    {% if _html_class contains "no_anchor" %}
-      {% assign skip_anchor = true %}
-    {% else %}
-      {% assign skip_anchor = false %}
-    {% endif %}
-
-    {% assign _idWorkspace = _workspace[0] | split: 'id="' %}
-    {% if _idWorkspace[1] %}
-      {% assign _idWorkspace = _idWorkspace[1] | split: '"' %}
-      {% assign html_id = _idWorkspace[0] %}
-    {% elsif include.generateId %}
-      <!-- If the header did not have an id we create one. -->
-      {% assign html_id = escaped_header | slugify %}
-      {% if html_id == "" %}
-        {% assign html_id = false %}
-      {% endif %}
-      {% capture headerAttrs %}{{ headerAttrs }} id="%html_id%"{% endcapture %}
-    {% endif %}
-
-    <!-- Build the anchor to inject for our heading -->
-    {% capture anchor %}{% endcapture %}
-
-    {% if skip_anchor == false and html_id and headerLevel >= minHeader and headerLevel <= maxHeader %}
-      {% if headerAttrs %}
-        {% capture _hAttrToStrip %}{{ _hAttrToStrip | split: '>' | first }} {{ headerAttrs | replace: '%heading%', escaped_header | replace: '%html_id%', html_id }}>{% endcapture %}
-      {% endif %}
-
-      {% capture anchor %}href="#{{ html_id }}"{% endcapture %}
-
-      {% if include.anchorClass %}
-        {% capture anchor %}{{ anchor }} class="{{ include.anchorClass }}"{% endcapture %}
-      {% endif %}
-
-      {% if include.anchorTitle %}
-        {% capture anchor %}{{ anchor }} title="{{ include.anchorTitle | replace: '%heading%', escaped_header }}"{% endcapture %}
-      {% endif %}
-
-      {% if include.anchorAttrs %}
-        {% capture anchor %}{{ anchor }} {{ include.anchorAttrs | replace: '%heading%', escaped_header | replace: '%html_id%', html_id }}{% endcapture %}
-      {% endif %}
-
-      {% capture anchor %}<a {{ anchor }}>{{ include.anchorBody | replace: '%heading%', escaped_header | default: '' }}</a>{% endcapture %}
-
-      <!-- In order to prevent adding extra space after a heading, we'll let the 'anchor' value contain it -->
-      {% if beforeHeading %}
-        {% capture anchor %}{{ anchor }} {% endcapture %}
-      {% else %}
-        {% capture anchor %} {{ anchor }}{% endcapture %}
-      {% endif %}
-    {% endif %}
-
-    {% capture new_heading %}
-<h{{ _hAttrToStrip }}
-  {{ include.bodyPrefix }}
-  {% if beforeHeading %}
-    {{ anchor }}{{ header }}
-  {% else %}
-    {{ header }}{{ anchor }}
-  {% endif %}
-  {{ include.bodySuffix }}
-</h{{ headerLevel }}>
-    {% endcapture %}
-
-    <!--
-    If we have content after the `</hX>` tag, then we'll want to append that here so we don't lost any content.
-    -->
-    {% assign chunkCount = _workspace | size %}
-    {% if chunkCount > 1 %}
-      {% capture new_heading %}{{ new_heading }}{{ _workspace | last }}{% endcapture %}
-    {% endif %}
-
-    {% capture edited_headings %}{{ edited_headings }}{{ new_heading }}{% endcapture %}
-  {% endfor %}
-{% endcapture %}{% assign headingsWorkspace = '' %}{{ edited_headings | strip }}

_layouts/about.html

----
-layout: default
----
-
-{{ content }}