Delete Studio references and docs

[Yiyun333]

Delete instances from refguide 9

[MarkvanMents]

@Yiyun333 - is this PR also going to delete all the Studio documents as well, or is there another PR for that? I can only see changes to documents and when I build it the Studio docs are still there.

[Yiyun333]

@Yiyun333 - is this PR also going to delete all the Studio documents as well, or is there another PR for that? I can only see changes to documents and when I build it the Studio docs are still there.

@MarkvanMents Studio docs will be deleted in this PR as well but later.

[MarkvanMents]

@Yiyun333
Haven't reviewed everything but the bits I've looked at seem great.
Won't approve as you still need to actually remove all the Studio docs, but looking good so far.

[MarkvanMents]

And still a couple of missing hashes - but plenty of time to resolve those:

[Yiyun333]

@Yiyun333 Haven't reviewed everything but the bits I've looked at seem great. Won't approve as you still need to actually remove all the Studio docs, but looking good so far.

@MarkvanMents Thanks a lot for the review! I'll remove the Studio docs very soon.