Intro tutorials for About API use cases

[lauralorenz]

Develop some vendor agnostic intro tutorials about the About API that can be easily digested as part of a generic documentation push. I think it would be useful to tie them to some common use cases as suggested below.

• About API for storing cluster name and sending as prometheus label in your metrics instrumentation
• About API for storing arbitrary, implementation specific cluster properties following the rules listed here and discussed on this slide, possibly a cluster's network name, region, etc

[lauralorenz]

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