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Add Google Drive as video provider (#1967)

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Use dark syntax highlighting

Adjust navigation toggles

Add focus color

Increase padding

Increase font-size

Update theme documentation

Update README.md

Update localized text list

Add support for utterances (#1966)

* Add support for utterances
* Add utterances config documentation
* Update CHANGELOG and history

Close #1909 

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Punjabi Translation of ui-text (#1962)

* Punjabi Translation of ui-text

There are more than 100 million native speakers of Punjabi language. I am one of them. More details about [punjabi on wikipedia](https://en.wikipedia.org/wiki/Punjabi_language).
All the punjabi translations are perfect with the following exceptions-
  - in the variable name (_config.yml and words_per_minute) which are intentionally left in english.
  - meta_label is empty

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Use privacy aware embed options for YouTube & Vimeo (#1964)

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

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