Final clean-up of the repo

[wa1234]

• [ ] Each file in the repo is in the proper directory
• [ ] Each file in the repo is meaningful and has a role, which is documented in at least one readme file
• [ ] The readme files are well formatted, grammatically reviewed
• [ ] The root readme file documents how to rerun the teaching
• [ ] The documented rerun of the teaching starts
• [ ] Code is well commented
• [ ] Never-used parts are not present
• [ ] Run the whole process of the teaching from zero

Deadline: dec 13 Estimated remaining time: 2h Reviewer: @wa1234 Depends on: