Remove quotes around single word font family names

Remove quotes from single word font family names as they are not needed and created inconsistency with other font family declarations in the document. This is minor.

*Litmus Tests*
* [Basic](https://litmus.com/pub/2ed7193)
* [Hero](https://litmus.com/pub/c5b1dfb)
* [Hero Sidebar](https://litmus.com/pub/2ca6316)
* [Sidebar](https://litmus.com/pub/6b613f4)