referenced .min.css file for CDN

put on dev branch per #2485
ensure PR on the dev branch

prevents re-submittals
hand-deleted changes

[Better update](https://github.com/FortAwesome/Font-Awesome/commit/c67253b626fbdea09357721aa2a21bb7f956d6db)
Merge pull request #2489 from tomByrer/4.0.4-wip

referenced .min.css file for CDN