Reuse registrations new view for after_auth
Move auth partials to authentications

Simplifies dir structure and cognitive overhead
Use postgres db user for local production
Add test page
Move AuthProvidersHelper into Authentications
Rename ErrorReporting to ErrorReportingConcern
Move devise rspec config to separate file
Add support for return_to path after sign in

Needs more tests, but seems to be working
Simplify registrations controller spec