Add limitation of Kubernetes distributions

[aii-nozomu-oki]

close #328

I decided to write this in the "Prerequisite" section of the "Start the control plane" page.
I note below the approach I didn't adopt.

• Create a new page called "Supported Kubernetes Distributions".
  Given the number of Kubernetes distributions, this seemed premature.

• "Kind is used for E2E testing and is 'supported' in that regard."
  This is probably an unnecessary statement since few people create products with Kind(It's mainly for testing).
  But if OCM is well tested in OpenShift (is it?) I think we can state "OCM is tested in OpenShift and Kind".

• "EKS support is ongoing."
  There is some work toward this, but it seems to have stalled a bit.
  Initial pass at stories for token registration enhancements#69

[mikeshng]

/approve

/lgtm

Thank you so much for your contribution! This PR makes a lot of sense.

[openshift-ci]

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[mikeshng]

@aii-nozomu-oki thank you again for your contribution.

Could you please see the comment in open-cluster-management-io/ocm#126 (comment)

I think using the standalone control plane (or what we call the multicluster control plane) the EKS issue can be addressed.

I think the idea is EKS host ocm multicluster control plane as hub cluster which has client auth enabled, so now managed clusters can registered to ocm-mcp enabling EKS hub support.

If you agree, I think we can create a new PR to explain the limitation and the workaround. Thanks! 🙏

[aii-nozomu-oki]

Oh, I didn't notice the issue.
I also interest in running OCM hub in EKS, so glad to hear the news. I'll take a look at it.
Of course, the statemenet I added can be edited in any way 🙂

[mikeshng]

@aii-nozomu-oki if you have some time, could you please give it a try on EKS and see if it works? If it works, I will create a edit PR. Thank you!