Merge branch 'master' into print-css

.github/release-drafter.yml

.github/workflows/ci.yml

404.html

_config.yml

_includes/nav.html

_layouts/default.html

_sass/code.scss

_sass/color_schemes/dark.scss

_sass/content.scss

_sass/layout.scss

_sass/navigation.scss

_sass/search.scss

_sass/support/_variables.scss

assets/js/just-the-docs.js

assets/js/search-data.json

assets/js/zzzz-search-data.json

docs/configuration.md

docs/search.md

just-the-docs.gemspec

lib/tasks/search.rake