Set the permissions on the archived stub community with message

Any Karl user, or any Karl user that previously had read access?

I think by the time we have the stub, we've wiped out the membership list. Otherwise, "My Communities" for a member would still show the community, as would other places (Profile -> Manage Communities.)

Well, we can bake the ACL before removing the membership list.

The community overview now uses a template which uses the 'admin_email' setting to fill in the email in the text provided above.

I also retain community membership so that I can still restrict view access on the community to people who already had view access. I explicitly remove, with an 'if' statement, any community with an archive status from 'My Communities'.