Add Link to wiki on lecture page

[SebiWrn]

Is your feature request related to a problem? Please describe. There should be a link to the https://docs.live.rbg.tum.de" website somewhere on the lecture page, especially for the selfstreams, so lecturers have a guide on how to setup selfstreams

Describe the solution you'd like Some links to the website on the course admin page, especially on the selfstreams