WIP: Improve Nostr user metadata fetching

Use a multi-step process, caching results in between, while informing
the user about the current steps/progress

config/routes.rb

@@ -68,7 +68,7 @@ Rails.application.routes.draw do
       post 'reset_email_password'
       post 'set_nostr_pubkey'
       delete 'nostr_pubkey', to: 'settings#remove_nostr_pubkey'
-      get 'fetch_nostr_user_metadata', as: 'nostr_user_metadata'
+      get 'fetch_nostr_metadata', as: 'nostr_metadata'
     end
   end