Add "spinner" image
Merge pull request #754 from RickMohr/spinner-image

Add "spinner" image
Style the not-available page

This page may show up a lot in our beta period if people share links to
their beta maps, which can not be made public.
Merge pull request #752 from jwalgran/topic/style-not-available

Style the not-available page
Fix footer/content layout bug, Fixes small label bug
Add "spinner" image
Style the not-available page

This page may show up a lot in our beta period if people share links to
their beta maps, which can not be made public.
Merge pull request #756 from mtedeschi/topic/beta-signup-styling

Beta signup styling
Added function decorator to automatically create instance user if allowed
Gate off UI buttons if the user cannot be promoted to an instance user