Display App Managers and contact info in Home tab -> Resources

[cd-rite]

Modify endpoint:
GET /users should support a "privileges" query param ["admin" , "create_collection"] that returns users with specified privilege

Client change:
Call above endpoint with admins value, getting display names and emails (if present)
Display App Managers in Home tab "Resources" widget.
This could be a list that requires the widget to be scrollable.

Allow Deployers to control behavior with some envvar like STIGMAN_RESOURCES_DISPLAY_ADMINS (default of true)