User panel tweaks

User control panel changes:
* Don't show pagination if the number of pages == 1
* Limit coaches to 5 per page.
* Limit students to 10 per page on generic facility view, 25 per page on group-specific view.
* Create better spacing between page sections.
* Make lack of data stand out / avoid blending across sections.
* Highlight "users" when Facility management & group management pages are visible.
* Italicize definitions, to make them separate from the title.
* Rename "Group" to "Student Group"
* Added tool-tips on each link to instruct what clicking the link does.
* Make link of student's group from facility management page go to group management page; from group management page go to coach reports.

Bugs fixed:
* When an admin is adding users, redirect to the add users page after a new user was added (facility info was being lost previously)
* When editing a coach, do not show the "group" field.
* Fix favico redirect URL (broken during static files refactor)

Testing:
* Tested each feature manually while exploring @rtibbles cool changes.

Notes:
* Tried to make commits very granular, since the functional changes were very diverse.

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