Cache "static" includes to improve build performance (#1874)

* Add jekyll-include-cache plugin
* Cache "static" includes to improve build performance
* Update CHANGELOG and history

"Static" refers to those includes that don't rely on data passed from the page content.

Make entire archive/feature item "clickable" (#1864)

* Make entire feature item "clickable"

Use a pseudo element on the call to action button to cover the entire feature item and make it "clickable".

* Make entire archive item "clickable"

Use a pseudo element on the `<a>` element to cover the entire archive item and make it "clickable".

* Update CHANGELOG and history

* Reference issue

Update CHANGELOG and history

Allow custom Staticman endpoints (#1845)

Update CHANGELOG and history

Update algolia-search-scripts.html (#1836)

not needed for HTML5 and saves a few bytes by removing

Merge branch 'master' of https://github.com/mmistakes/minimal-mistakes

Update CHANGELOG and history

Remove unneeded HandheldFriendly and MobileOptimized meta tags (#1837)

Fixes: #1835

Update CHANGELOG and history

Update Font Awesome to latest version (#1830)

Update CHANGELOG and history

Properly apply `relative_url` filter to internal links in header overlay `actions` array

Remove deprecated `base_path` include helper

Release 4.13.0 💎

Add Romanian localized UI text strings

Update ui-text.yml with Romanian translation (#1814)

* Update ui-text.yml with Romanian translation

Added the translations for Romanian

* Update ui-text.yml

Corrected „less_than” with a proper translation for the context where it is being used

* Update docs

Added Romanian to the languages list

Add social icon colors for Reddit and Mastodon

Update CHANGELOG and history

Improve footer link flexibility

Deprecate hardcoded footer links in favor or new `footer.links` array for any link and in any order. All of Font Awesome's icons are available for use.

```
footer:
  links:
    - 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"
```