Community Mode: Signup - Flow

[tibfox]

It would be very cool if we would have a signup workflow implemented in superhive community mode.

The account creator identity should be configurable in case it's different to the community (which would very often be the case). Best would be the option to add multiple identities.

It should check against email-domain-blacklist (one-time-use email domains) and should also check for uniqueness in the emails used to register accounts.

Different to other Hive interfaces it should not ask for phone verification and should also not have ip-restrictions. Maybe these two could be optional but in my opinion we lose a lot of onboardings at this first step.

The mail template with keys should be customizable.