Add information on k/website about supported platforms

[saschagrunert]

We have multiple existing documents about supported platforms already available:

• https://github.com/kubernetes/sig-release/blob/master/release-engineering/artifacts.md
• https://github.com/kubernetes/sig-release/tree/master/release-engineering/platforms

Collecting them on k/website would spread their visibility and more official.

[saschagrunert]

/help
/kind documentation
/priority important-soon

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@saschagrunert:
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In response to this:

/help
/kind documentation
/priority important-soon

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