* Add a transparency page where regular user accounts can list the roles and
permissions that an admin user has access to. It is available by clicking on
the "Admin" badge on that user's profile page.
* Add additional admin scopes to lock down more functionality:
* User feedback and reports
* Change logs
* User notes and admin notes
* Add friendly descriptions to what all the scopes mean in practice.
* Don't show admin notification badges to admins who aren't allowed to act on
those notifications.
* Update the admin dashboard page and documentation for admins.
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