EduSlides - content check

[DorienHuijser]

I've updated the structure of the workshop a bit, also based on some feedback from Neha. Now git is not mentioned anywhere before the first break, but the Markdown section is shortened a lot and put in the first section instead. The slides with the writing hand ✍️ indicate practical work/exercises, but for some exercises the instructions are really long. Not sure if that's an issue, but if you have ideas to either change/improve the exercises, move them, or remove them, feel free to change it. An entire content check from you both would be nice so that we're all on the same page!