Adaptations of skill tutorials
- Fixing some typos and suggesting other formulations
- Adding more extensive background information
@uxiic_schaub and @ucskd_vigneron, do you agree to the changes made by me? If yes, please merge it into your branch (I can technically assign only one of you, this time starting alphabetically, but both of you are meant). You can make changes by pushing further commits to this branch beforehand.
After everything is merged, we will ask Fabian T. to check for the correctness of all information.