Group improvements
- [Normal]
- Hide the interest list from students if invitations are not possible
- [Admin]
- Make it easy to select interested coaches into course specific roles
- [Project overview]
- Make each group collapsible and collapsed by default
- Rearrange elements to get a better overview at-a-glance
- Changed "looking for a group" to "Interest List", since it also shows coaches
- [Groups overview]
- Add link to the group management in the normal interface
- Make notes collapsible panels, collapsed by default if no notes present
Addresses remaining points of #213 (closed) Closes #213 (closed)