Auto-join improvements

Two changes: you can now add as many auto-join domains as you like, and auto-join no longer requires signing in with Google.

Auto-join lets people from your company land in the right Reflag organization the moment they sign up, without waiting on an invite.

We heard from several of you that you'd like to have auto-join support multiple domains. This becomes relevant in particular after a merger , acquisition or rebranding left your team split across two or more email addresses.

Enjoy!