Install rails_admin and devise. Start setting it up.

config/environments/development.rb

@@ -36,6 +36,8 @@ Rails.application.configure do
 
   config.action_mailer.perform_caching = false
 
+  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 

config/environments/production.rb

@@ -66,6 +66,8 @@ Rails.application.configure do
   # Set this to true and configure the email server for immediate delivery to raise delivery errors.
   # config.action_mailer.raise_delivery_errors = false
 
+  config.action_mailer.default_url_options = { host: 'sscalc.lage.pw', port: 443 }
+
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation cannot be found).
   config.i18n.fallbacks = true