Update nav with faq resource

[lilybarrett]

Here's a PR for updating the nav with a link to the FAQ page, for easier access by users. Updated the tests, as well, and ran them to ensure all pass.

One caveat: The contribution docs had requested that I run git fetch upstream and then git rebase upstream/production. When I ran those commands, I got the following error:

fatal: 'upstream' does not appear to be a git repository
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

[lilybarrett]

Just reminding folks of this PR!