Construct NIP11 from config

[0ceanSlim]

I need to look at constructing the NIP11 from the config. Right onw it relys on the relay operator to set the NIP11 information manually. This can and will lead to operators not always having an accurate NIP11 document as per other nip requirements. For instance, if a whitelist is enabled, the NIP11 document should not advertise NIP65 compatible per NIP65 Final Considerations #5. NIP11 also has some extra fields that can be defined. These extra fields can be abstracted from the config.yml.