* 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
* enable markdown in author bio
added the markdownify liquid filter
* Add markdown to bio in _config.yml
* add markdown to bio in /test/ _config.yml
* Change <p> to <div>
Google+ is being shutdown on April 2, 2019. Social sharing buttong, comment provider, and author link configs have been removed from the theme.
ref: https://support.google.com/plus/answer/9195133
Deprecate social networking links in `_config.yml` in favor or new `author.links` array for any link and in any order. All of Font Awesome's icons are available for use.
```
author:
links:
- label: "Your Website"
icon: "fas fa-fw fa-link"
url: "https://your-site.com"
- label: "Twitter"
icon: "fab fa-fw fa-twitter-square"
url: "https://twitter.com/username"
- label: "GitHub"
icon: "fab fa-fw fa-github"
url: "https://github.com/username"
- label: "Instagram"
icon: "fab fa-fw fa-instagram"
url: "https://instagram.com/username"
```
Fixes#1581
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
* Fix canonical URL
* Fix next/previous page paths
* Group meta types together
* Fix twitter:creator conditional
* Allow `author` to accept an object or string
* Reduce white-space
* Add "website" as default `og:type`
* Add `article:modified_time`
* Show `article:modified_time` on `article` only
Fixes#289
