George Kalpakas fa0c65efe5 build(docs-infra): remove dependency on FontAwesome (#27250)
We were only using two FontAwesome icons (`link` and `twitter`). The
twitter icon is already available as an SVG (used in the topbar) and a
similar link icon is available via 'Material Icons', which we are
already brining in.

This commit removes the dependency on FontAwesome and uses the available
icons instead.

_Before:_
![contributor-info-before](https://user-images.githubusercontent.com/8604205/49089076-61b90680-f263-11e8-8c5f-c52d332e6e64.png)

_After:_
![contributor-info-after](https://user-images.githubusercontent.com/8604205/49089075-61b90680-f263-11e8-9785-b8df15aaacd3.png)

PR Close #27250
2018-12-05 13:26:27 -08:00
..
2017-03-13 12:55:11 -07:00