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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

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Improve color contrast of primary buttons and links

Fix breadcrumb navigation alignment

Fixes #1917

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

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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)

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Update LUNR to 2.3.3 (#1885)

Close #1882

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Fix Lunr search index merging words (#1884)

Close #1883

Move jekyll-include-cache notice up

Add notice for fixing `Unknown tag 'include_cached'`

Fixes #1875

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.