Merge remote-tracking branch 'upstream/master'

.github/ISSUE_TEMPLATE/config.yml

.github/workflows/ci.yml

.prettierignore

.prettierrc

.stylelintrc.json

_sass/base.scss

_sass/code.scss

_sass/color_schemes/dark.scss

_sass/layout.scss

_sass/support/_functions.scss

_sass/support/_variables.scss

_sass/support/mixins/_layout.scss

_sass/utilities/_layout.scss

_sass/utilities/_spacing.scss

assets/js/dark-mode-preview.js

just-the-docs.gemspec

lib/tasks/search.rake

package-lock.json

package.json