Clearer permissions on Settings and Users

Settings and Users now show only what your role lets you do, and explain why when a change isn't allowed.

Settings is view-only for non-admins. Teammates who aren't admins can still see your business hours, but can't edit them. A note at the top of the page explains why. The Other Settings section is shown to admins only.
Managing users is for admins. Only admins see Add User and the revoke, restore and delete actions on the Users page. Everyone else sees the team list without them.

If GearVox can't revoke or restore someone's access, the message now says why, for example when you try to revoke your own access or remove your account's last admin. Before, it only said "Please try again."