doc: update helmCharts with OCI registry support

[shivanshs9]

Fixes #378

Thanks to kubernetes-sigs/kustomize#5167, Kustomize finally support OCI helm repos, but the docs weren't up-to-date with this new feature.

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[koba1t]

@shivanshs9

private repository or registry authentication

We didn't support pulling images from private repositories.
I plan to rearchitecture by using any credential to pull.
kubernetes-sigs/kustomize#4401

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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