Add relays fields

You can attach multiple relays uri's to a pubkey.

The optional "relays" attribute may contain an object with public keys as properties and arrays of relay URLs as values. When present, that can be used to help clients learn in which relays that user may be found. Web servers which serve /.well-known/nostr.json files dynamically based on the query string SHOULD also serve the relays data for any name they serve in the same reply when that is available.

More info: https://github.com/nostr-protocol/nips/blob/master/05.md#example

We need to extend the configuration for submitting multiple relays associated with a pubkey.