Added missing ref attribute (#1959)

As suggested by @mmistakes in https://github.com/mmistakes/minimal-mistakes/issues/1948#issuecomment-439888193

Fix FontAwesome script

ref #1922

Add `crossorigin` attribute to FontAwesome script

ref #1922

Update CHANGELOG and history

Add rel attribute to social media links in author profile and fotter (#1924)

Update CHANGELOG and history

add integrity hash for Font Awesome script (#1922)

* add integrity hash for Font Awesome script

As the script is loaded from an external CDN (use.fontawesome.com), its integrity must be ensured mainly for security reasons.
This hash must be updated together with the exact version of Font Awesome, as given on their website.

* Update to FontAwesome 5.5.0

Update CHANGELOG and history

Improve color contrast of primary buttons and links

Fix breadcrumb navigation alignment

Fixes #1917

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

Update CHANGELOG and history

Hindi Translation of ui-text #1887 (#1888)

* Hindi Translation of ui-text #1887
* Update README.md and about.md

Revert caching for comments and analytics. Fixes #1905 (#1907)

Fix Algolia search link positioning (#1904)

* Add link for testing purposes
* Fix excerpt link positioning in Algolia search results
* Fix Algolia search input color
* Update CHANGELOG and history

Fixes #1903

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

Fix license path

Update license (#1886)

Update CHANGELOG and history

Update LUNR to 2.3.3 (#1885)

Close #1882