The anchor heading item is keyboard focusable, but when focused and not hovered, it is not visible. This PR fixes that. Also, great project!

**Rationale**
I would like to customize the site footer content without needing to override the entire default layout. Ideally, I'd like to shorten the attribution to something like "Built with Just the Docs"

**Implementation**
Create a new `site_footer.html` include that users can override.

**Possible changes**
I debated whether or not the `<footer class="site-footer">` should be in/out of the include. I opted for placing it inside the include so I have the option of disabling the footer entirely by creating an empty site_footer file in my site.

Co-authored-by: Matt Wang <matt@matthewwang.me>
Co-authored-by: Patrick Marsceill <pmarsceill@users.noreply.github.com>

Fixes #488.
- Replace `''` by `""` in rake script and resulting search data file.
Tested on macOS Catalina.

Set `child_nav_order` to `desc` to reverse the sort order for a child section.

Co-authored-by: Matt Wang <matt@matthewwang.me>

Looking at how the variables are defined in _variables.scss, with various dependencies between them aimed at ensuring a consistent color scheme, one might expect that redefining a given variable would affect the remaining styles that depend on it.

This is not the case, however, due to the order in which the files are processed. This PR edits the documentation to mention the non-propagating behavior of redefined variables, to better guide users that wish to customize the site using custom themes, and call their attention to the need to redefine the dependency relations as well.

Co-authored-by: Matt Wang <matt@matthewwang.me>
Co-authored-by: Patrick Marsceill <pmarsceill@users.noreply.github.com>

* implements search placeholder configuration

* changes implementation approach to use search_placeholder_custom

Thanks to @pdmosses for the suggestion!

* strips whitespace and HTML for both placeholder and aria-label

Fix #685
- Wrap scss file in comments with `{% raw %}` and `{% endraw %}` tags

Co-authored-by: Matt Wang <matt@matthewwang.me>

Fix #517

Users expect nested task lists to have the same indentation as other lists.
Fix the styling in `_sass/content.scss` to do that.
Add examples in `docs/index-test.md` to test.

As is, this is invalid and will not cause the TOC to be rendered. The collapsing example is fine.

Co-authored-by: Matt Wang <matt@matthewwang.me>
Co-authored-by: Peter Mosses <18308236+pdmosses@users.noreply.github.com>

These docs outline some of the custom includes that are provided by the theme and can be modified by the user.

Co-authored-by: Matt Wang <matt@matthewwang.me>
Co-authored-by: Patrick Marsceill <pmarsceill@users.noreply.github.com>

* Show how to break an ol

Close #750

The theme uses CSS counters for ordered lists.
So to continue the numbering of an ordered list after a break,
use `style="counter-reset:none"` instead of `start="42"`.
Add the example from #750 to `docs/index-test.md` to test.

* Show how to start from 42

Close #750

The theme uses CSS counters for ordered lists.
To start the numbering of an ordered list with 42,
use `{:style="counter-reset:step-counter 41"}` instead of `start="42"`.

Add the example from #750 to `docs/index-test.md` to test.

This PR combines (and resolves conflicts between) #448, #463, #466, #494, #495, #496, #498, and #572. 

The main aim is to facilitate use of several of the implemented features _together_, when using the fork as a remote theme. It should also simplify merging the included PRs into a future release.

The branch [combination-rec-nav](https://github.com/pdmosses/just-the-docs/tree/combination-rec-nav) adds [multi-level navigation](https://github.com/pmarsceill/just-the-docs/pull/462) and (NEW:) [sibling links](https://github.com/pmarsceill/just-the-docs/pull/394) to the branch used for this PR. It includes updated [documentation for the navigation structure](https://pdmosses.github.io/just-the-docs/docs/navigation-structure/), and reorganised and extended [navigation tests](https://pdmosses.github.io/just-the-docs/tests/navigation/). The documentation and the tests can be browsed at the (temporary) [website published from the combination-rec-nav branch](https://pdmosses.github.io/just-the-docs/

).

_Caveat:_ The changes to v0.3.3 in this PR and #462 have not yet been reviewed or approved, and may need updating before merging into a release of the theme. If you use a branch from a PR as a remote theme, there is a risk of such updates affecting your website. Moreover, these branches are likely to be deleted after they have been merged. To avoid  such problems, you could copy the branch that you want to use to your own fork of the theme.

Co-authored-by: Matt Wang <matt@matthewwang.me>

Bumps [prettier](https://github.com/prettier/prettier) from 2.6.2 to 2.7.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.6.2...2.7.1

)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
  update-type: version-update:semver-minor
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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

This PR adds a small link back to Netlify in the footer (specifically, in the user-editable config); this is a necessary prerequisite for the [Netlify OSS Plan](https://www.netlify.com/legal/open-source-policy). 

See: https://github.com/orgs/just-the-docs/teams/maintainers/discussions/1/comments/18.

Bumps [prettier](https://github.com/prettier/prettier) from 2.5.1 to 2.6.2.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.5.1...2.6.2

)

---
updated-dependencies:
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  dependency-type: direct:development
  update-type: version-update:semver-minor
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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

This is one solution for #798, namely that `webrick` is needed as an explicit dependency for Ruby 3+.

Closes #798.

updates Code of Conduct to Contributor Covenant v2.1

See - https://www.contributor-covenant.org/version/2/1/code_of_conduct/

* Set color for search input

Fix #497
- Insert `color: $body-text-color;` in styling for `search-input`.

* Update search.scss

Prettier

Co-authored-by: Matt Wang <matt@matthewwang.me>

Co-authored-by: Matt Wang <matt@matthewwang.me>

Co-authored-by: Matt Wang <matt@matthewwang.me>

Co-authored-by: Matt Wang <matt@matthewwang.me>

Bumps [prettier](https://github.com/prettier/prettier) from 2.1.2 to 2.5.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.1.2...2.5.1

)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Add VScode devcontainer

Upgrade to GitHub-native Dependabot

Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.10.0 to 6.12.6.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](https://github.com/ajv-validator/ajv/compare/v6.10.0...v6.12.6

)

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- dependency-name: ajv
  dependency-type: indirect
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Bumps [path-parse](https://github.com/jbgutierrez/path-parse) from 1.0.6 to 1.0.7.
- [Release notes](https://github.com/jbgutierrez/path-parse/releases)
- [Commits](https://github.com/jbgutierrez/path-parse/commits/v1.0.7

)

---
updated-dependencies:
- dependency-name: path-parse
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [ini](https://github.com/isaacs/ini) from 1.3.5 to 1.3.8. **This update includes a security fix.**
- [Release notes](https://github.com/isaacs/ini/releases)
- [Commits](https://github.com/isaacs/ini/compare/v1.3.5...v1.3.8

)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Patrick Marsceill <pmarsceill@users.noreply.github.com>

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.19 to 4.17.21. **This update includes a security fix.**
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.19...4.17.21

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Patrick Marsceill <pmarsceill@users.noreply.github.com>
Co-authored-by: Matt Wang <matt@matthewwang.me>

[Security] Bump hosted-git-info from 2.7.1 to 2.8.9