R1:8f8e863613c0

When users follow an email login link but an install does not use passwords, try to get them to link an account

Summary:
Ref T13249. See PHI774. When users follow an email login link ("Forgot password?", "Send Welcome Email", "Send a login link to your email address.", `bin/auth recover`), we send them to a password reset flow if an install uses passwords.

If an install does not use passwords, we previously dumped them unceremoniously into the {nav Settings > External Accounts} UI with no real guidance…