Changed Mentor Achievement to be Unclickable + Code Cleanup

Thijs de Jong
2019-04-03T20:34:15+02:00

The achievements on the profile page of a member were all clickable, including the ``Mentor`` achievements, which lead to nowhere.

#### New behaviour
The ``Mentor`` achievements are no longer clickable, and are black instead of magenta.
Also cleaned code in ``profile.html``