📜 Slides update

[MarleenGilsing]

fixes #5805
fixes #5051
fixes #5028

Started working on updating the slides. I added notes for the teachers as well. I've done level 0, 1 and 2 now.

@Felienne and/or @AnneliesVlaar, I'd love to hear what you think of the notes (then I'll take that into account before I continue with the rest of the levels).

[AnneliesVlaar]

Hi @MarleenGilsing I think these notes can be really beneficial for to get a grip on a lesson plan. How and when are these notes presented? Do you want detailed feedback on the notes?

[MarleenGilsing]

@AnneliesVlaar They are presented like the speakers notes you can add to a powerpoint. So the teacher can see them when presenting (if they are using a seperate screen to presnet from). Or they can just look at the notes before giving the lesson of course.

It doesn't need to be detailed feedback (unless you feel like it of course, haha), but more 'over all feedback'. Like, if you were a teacher without much programming experience, would this be helpful? Or would you like more/less info? Would you like a whole script of what to say, or are these short notes enough?