Wiki page updates

1. Allow to create and use left menu like 'Profile Followings'.
2. Minimize left menu to collapsible "Contents" element on mobile. Should be collapsed by default.
![изображение](https://github.com/unacms/una/assets/3894360/b018f943-87bd-48da-aeb6-31c95f54cba5)
3. If menu (from point 1) is used then "Contents"title should be replaced with title of currently active menu item.
