add mobile settings navigation

app/views/personalization_settings/show.html.erb

@@ -1,6 +1,6 @@
 <div class="flex flex-wrap space-y-4 md:flex-nowrap md:space-y-0">
   <%= render 'shared/settings_nav' %>
-  <div class="flex-grow max-w-xl mx-auto">
+  <div class="flex-grow md:max-w-xl md:mx-auto">
     <p class="text-4xl font-bold mb-4">
       <%= t('email_templates') %>
     </p>