Rename to 'TwoFactorAuth'. Lots of churn but no code changed.

While 'FidoLogin' was a sensible name, I didn't want to imply this was an
official library from FIDO (or have to disclaim that everywhere...). Here's a
nice generic name.
Update test env with missing migration; tests still broken
Restore some fidologin domains to match fixtures
Start README
registered domain, published