I implemented a check for both DM relays and deprecation warning.

This is how it will look for existing user's who have not cleaned up their following list yet:

One step is missing and that's auto-publish DM relay list on behalf of new accounts, I'll get that done later.

Regarding discovery of relays, could do something similar to Discovery Relay, where there is a button that will perform latency check for Discovery Relays.

Thanks for the feedback!