Refactor admin settings, add all service settings

app/controllers/admin/settings/registrations_controller.rb

@@ -4,25 +4,7 @@ class Admin::Settings::RegistrationsController < Admin::SettingsController
   end
 
   def create
-    @errors = ActiveModel::Errors.new(Setting.new)
-
-    setting_params.keys.each do |key|
-      next if setting_params[key].nil?
-
-      setting = Setting.new(var: key)
-      setting.value = setting_params[key].strip
-      unless setting.valid?
-        @errors.merge!(setting.errors)
-      end
-    end
-
-    if @errors.any?
-      render :index
-    end
-
-    setting_params.keys.each do |key|
-      Setting.send("#{key}=", setting_params[key].strip) unless setting_params[key].nil?
-    end
+    update_settings
 
     redirect_to admin_settings_registrations_path, flash: {
       success: "Settings saved"