Akshaj class settings

[AkshajK]

Allow for editing of: class description, term, contact email

Displays these three features on the course contents page for everyone to see (if they are put in by instructor)

[JumanaFM]

Thank you Akshaj for your PR, the additions you made look good. However, I wonder why you have removed "institution" from the model? It is something that we actually want to store. Can you please keep it in the model and add it to UI (don't make it mandatory).

[AkshajK]

regarding the institution, I noticed that there already was an institution field in the codebase, which described the institution ID (and linked to a institution object). I had added another institution fieldd which was just a string earlier (but commented out), so I removed it. The already existing institution field is an object (which makes sense, we don't want to store MIT and Massachusetts Institute of Technology as seperate institutions i guess) but then it makes changing it more complicated (we'd need a dropdown as well as a "add new option" so I thought for now I wouldn't put it in the class settings tab

However, i put it in the frontend so if the institution field is ever populated, it will show up in the class dashboard!