[Website] Add Scalability Best Practices & Considerations for DoEKS Workloads

[brianhammons]

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What is the outcome that you are trying to reach?

Published DoEKS scalability findings collected from years of operating data intensive workloads on Amazon EKS

Describe the solution you would like

Prescriptive guidance for DoEKS community

Describe alternatives you have considered

Additional sources for AWS provided guidance are published online (e.g. EKS Best Practices Guide)

Additional context