We originally had only a few groups, namely:

* introduction 001-100
* style 101-200
* components 201-300
* advanced 301-400
* addons 401-500

So it made sense to have weights divided by hundreds even though it might be cryptic, it was very scalable.

Now however we have many groups, so it makes more sense to split them by tens:

* setup 01-10
* introduction 11-20
* style 21-30
* components 31-60 <-- Needs to have a lot of space for new Kirigami components as we go
* advanced 61-70
* data 71-80
* addons 81-90

Starting from 1 instead of 0 makes sense in either case so "first page of group" == 1, "second page of group" == 2, etc.

This MR changes nothing visually, it just changes the weights used for the Kirigami tutorial to make more sense.

This was supposed to have been done with !543 and I forgot about it, I wasn't in a good headspace then.