Reduce sync poll frequency, cost
Hackily kick logged out users out of synchronization status check loop
Revert "Reduce sync poll frequency, cost"

This reverts commit 1daafc63ae75c1dad1d58098e856dc7d03f0b042.
Remove old news from dashboard.
Rename ServiceRecordIDsForPartialSyncTrigger -> ExternalIDsForPartialSyncTrigger
Kick logged-out users from dashboard in a less hacky way.
I checked the weather forecast
Or, rather, that the End of Days is upon us?
Enable USE_X_FORWARDED_HOST
Celebration mode
Merge branch 'celebration-mode'

* celebration-mode:
  Celebration mode
Aggregate common errors by service
FAQ updates
Fix inaccuracy on privacy page w.r.t. payment emails.
Colour-code worker freshness status
Disable old service poll route
Negligible capitalization fix.
Add Redis infrastructure
Use Redis to store Endomondo OAuth request credentials
Store Dropbox oauth auth request credentials in redid, too.