* Use relative_url and absolute_url where possible
Drops the `contains "://"` check, adopt Jekyll 3.7
Ref: https://github.com/mmistakes/minimal-mistakes/pull/2385#issuecomment-579882236
* One more unneeded {% assign %}
* Remove one more assign as noted by mmistakes
* Consolidate 4 more captures
* Consolidate an extra assign on "active" class
* Add site subtitle
* Tabs vs spaces - the ancient conflict
* updates cfr PR #2205
* Perhaps also add the closing anchor
* Make sure we check for the right variables...
* Brown paper bag - subtitle, not description
* Add logo and title customization to the masthead
* Adjust config description
* Add test site logo to `/test`
* Document `site.logo` and `site.masthead_title`
* Update CHANGELOG and history
* Accessibility: Add aria-label to the search button
* Update button aria text
* Add aria text to menu toggle
* Add span for search toggle
* Update span for menu label & remove aria
* Update ui-text.yml to add search_label
Where it makes sense replace asset paths and navigation related paths with `relative_url` filter.
Leave SEO related `<head>` elements and social sharing links as `absolute_url`.
Fixes#1588
