instancetype: Separate docs and give ownership to sub-project

[lyarwood]

/cc @aburdenthehand
/cc @0xFelix
/cc @vladikr

What this PR does / why we need it:

I'd like to rework the instance type docs quite extensively during the 1.4 cycle. Ahead of this it would be useful if we could give ownership of the docs to the instance type sub-project approvers as has already happened with the code within KubeVirt itself.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #818

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Release note:

NONE

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[0xFelix]

Good idea!

/lgtm

[0xFelix]

@phoracek PTAL, thanks!

[phoracek]

@lyarwood I fully support and appreciate you owning your part of the user-guide. However, would you please split the part where you introduce a new subsection of "User Workloads" page from the OWNERS change? It may require you to explicitly list all the files your group owns instead of having a convenient subdirectory.

I would like @aburdenthehand to review the change to the structure, and that may take a while. Personally, I don't like that it adds another layer to the menu, but perhaps we can make it work.

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PR needs rebase.

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[aburdenthehand]

+1 to Petr's comment. Especially the taking ownership of content 🎉
Are you planning on adding a lot of content? Like, does it make more sense to put this at the same level as 'Workloads' and 'Monitoring'? That gets the same sensible ownership of the directory but without the nested level in the TOC.

Would there be any other content from this section that would make sense to group together with instancetypes, that compute/instancetypes would own? (I ask because I wondered if something like 'Presets' would be a useful section name so that it also draws the attention of folks that aren't familiar with instancetypes as a term, so I might expect to see presets and templates also be pulled into that box.)