Remove the loading/initialization state in nav

[willyogo]

Currently whenever a user begins a new session or refreshes the page, the app temporarily will render an initialization state while it checks to see if the user is fully auth'd.

As a user, I want the app to immediately know whether I'm logged in so I never have to experience the initialization state.

AC:

1. Users no longer see the initialization state

Proposed solution from @nounspaceryan: add auth state to user session