* Bind sessions to identities
* Remove references to the identity token
* Move email changes to identity
* Move account menu into a turbo-frame
* Create tenants from a tenanted route
Up from the previous 5 seconds. It's still short enough that the pages
shouldn't feel stale, but it further reduces the number of requests that
will reach the app.
Also moved this into a shared concern so we can adjust the caching rule
in one place.