self-hosted/docs: EKS ref architecture may not indicate how to fetch EKS credentials

[adrienthebo]

Is your feature request related to a problem? Please describe

The EKS reference architecture doesn't mention the aws update-kubeconfig command, which is used to fetch cluster credentials for a pre-existing cluster. It may be that eksctl will automatically fetch these credentials this path hasn't been verified. In addition if users are running the installation within a Gitpod workspace (as we're doing for the development of the guide) these credentials will be lost when a workspace is relaunched.

Describe the behaviour you'd like

Documentation should be provided explaining the eksctl utils write-kubeconfig and/or aws eks update-kubeconfig commands.

[stale]

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