[Enhancement] Group widget messages by users (#367)

* Remove thumbnail

* Show grouped messages

config/environments/staging.rb

@@ -66,6 +66,8 @@ Rails.application.configure do
     enable_starttls_auto: true
   }
 
+  Rails.application.routes.default_url_options = { host: ENV['FRONTEND_URL'] }
+
   # Ignore bad email addresses and do not raise email delivery errors.
   # Set this to true and configure the email server for immediate delivery to raise delivery errors.
   # config.action_mailer.raise_delivery_errors = false