Improve teacher statistics

[Felienne]

Currently, our teacher statistics are a bit messy, showing a lot of data but not so much information.
For example, these graphs don't really help me to see who is not doing well:

We need to make some sort of plan here so we can split this into separate issues.

[Felienne]

A few ideas that I would really like:

A tile for each student showing the most important characteristics, rather than a graph per metric. Something like:

[Felienne]

At one point, we might even define for statistics for "at risk" students and make those tiles red.

[Felienne]

When you then click a tile, you get more detailed information for a student, for example:

[Felienne]

Mostly addressed by students last semester!