📖 docs: add ClusterClass CRD relationships diagram

[Kausheel]

What this PR does / why we need it:

The change adds a new diagram to show the ClusterClass's relationships with other CRDs, hopefully making it easier to understand how a ClusterClass fits in with the other resources.

I've tested the change with make serve-book to confirm the image sizing/alignment looks correct.

Which issue(s) this PR fixes:

Fixes #8558

/area documentation

[k8s-ci-robot]

Hi @Kausheel. Thanks for your PR.

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[sbueringer]

Thx!

How was the image created and how can we update/maintain it going forward?

[Kausheel]

Hi @sbueringer !

The image is in SVG file format, which is an open standard supported by any graphics editor (Adobe, Canva, Gimp, Inkscape, etc). I used MacSVG which is an open source editor, but other contributors wanting to update the image in the future can use many other supported editors.

The format is XML-based, so all the diagrams/arrows etc can be moved around from any editor without needing access to any "source" files like in other image formats. So you can freely edit the image I uploaded without any dependencies.

[sbueringer]

Makes sense, thx!

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

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Git tree hash: c714605f0906dad221d56d5ed2d1294d345bc354

[k8s-ci-robot]

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This pull-request has been approved by: sbueringer

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