Remove quotes from font-family declaration

Remove quotes from font-family declaration as they are not needed and created inconsistency with the declaration elsewhere in the document. It 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)