Course overviews: Faceted filtering

[cyroxx]

Because we have so many courses in each term (Semester), one cannot keep track of every single course.

In order to navigate to a course or to narrow the the group of courses which qualify for further inspection, there should be an option to filter by certain facets like Bachelor/Master, course type (lecture, seminar, project, exercise) and others. One example is the "Browse issues" view here on Github where you may filter the issues selecting several facets on the left hand side of the screen.

[cyroxx]

Eine weitere Facette wäre übrigens noch der Dozent.

[schulzt]

Fände definitiv gut!

Der Dozent sollte auch sowieso dort auftauchen.

Auch noch mehr Infos, wie Teilnehmeranzahl wären hilfreich (bspw. wann LVs für die Evaliuerung zusammengelegt werden sollten)

[karyon]

number of participants is now part of #257, the name of the responsible person is already shown and faceted filtering is not necessary.