chore: Add submenu for super admin settings (#11860)

- Improve how settings are rendered in Chatwoot Super admin panel
- Add google settings support 
- show setting for community edition

##  Settings page - community edition
<img width="1702" alt="Screenshot 2025-07-08 at 9 08 03 PM"
src="https://github.com/user-attachments/assets/0434f56f-ea74-44a8-a7b0-8e26fab88093"
/>

## Expanded settings
<img width="1675" alt="Screenshot 2025-07-03 at 2 17 16 AM"
src="https://github.com/user-attachments/assets/3aa1f888-c54a-4b58-896a-0d3e828fa176"
/>

---------

Co-authored-by: Sojan Jose <sojan@Sojans-MacBook-Pro.local>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/views/super_admin/application/_nav_item.html.erb

@@ -1,6 +1,4 @@
-<li
-  class="px-4 border-l-4 mb-1 <%= current_page?(url) ? 'border-woot-500' : 'border-transparent' %>"
->
+<li class="px-4 mb-1">
   <% text_class_name = current_page?(url) ? 'text-woot-500 bg-slate-25' : 'text-slate-800' %>
   <%= link_to(url, class: text_class_name + " -ml-1 focus:outline-none cursor-pointer flex items-center px-2 py-1.5 text-slate-800 cursor-pointer hover:text-woot-500 hover:bg-slate-25 rounded-lg") do %>
     <svg width="16" height="16"><use xlink:href="#<%= icon %>" /></svg>