Document the supported architectures (x86, arm64) somewhere visible

[Maleware]

Tasks

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1. Document supported architectures
2. Delete experimental ARM page from docs

[fhennig]

Which releases support ARM64, and are there any exceptions still? I.e. only certain products or certain versions? Anything that needs to be done, or just pull as normal?

[fhennig]

hey, @Maleware I think this can be closed now that stackabletech/documentation#605 was merged. Can you check?

[Maleware]

Yeah only thing left would be to remove this and refer to the current dev versions as experimental access through our main channel (helm install 0.0.0-dev or stackablectl operator install <operator-name>=0.0.0-dev) and then running with 0.0.0-dev product images