Suggest existing organisations / teams on signup with matching non-generic domains

[kyle-ssg]

Is your feature request related to a problem? Please describe.

A common problem is that users incorrectly create a duplicate organisation because they haven't received / seen an invite from their team.

Describe the solution you'd like.

• Allow users with non-generic emails to see existing organisations created by users with the same domain.
• Allow users to request an invite to an organisation

Additional context

This was brought up as a way to improve time to first feature / improve onboarding

[dabeeeenster]

Hmm this would need to be designed very carefully so as not to leak information. I'm worried it would be hard to get any sort of canonical list of "non generic emails"

[dabeeeenster]

Maybe there is a way for us to not show the users but instead send an invite to the admin to request to join an org.