Allow anyone to see a user's "Favorites" list

[bloudermilk]

Anyone should be able to visit a public page of each user's favorites. For example: /bloudermilk/favorites. That page should list all the user's favorited organizations ordered with most recently favorited first.

This page will be client-side rendered, so we'll need to be able to query OrganizationCard data from GraphQL (see #280) before this can work. We also don't have any way for user's to change their username right now, though Auth0 assigns them one on signup.