Remove Kustomize references in docs and replace with Helm Chart

[marcosmarxm]

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[pmossman]

I don't think this is true for Helm charts. As far as I know, the .env file has no impact on Helm deployments of Airbyte. Instead, values need to be defined in the env-configmap.yaml template.

@git-phu could you sanity check my claim here?

[git-phu]

Yes that is correct. Modifying the .env file has no impact on Helm deployments.

The instructions for configuring a helm deployment are already present in the linked helm docs here https://docs.airbyte.com/deploying-airbyte/on-kubernetes-via-helm/#custom-deployment

[marcosmarxm]

@git-phu @pmossman can you check the new sentence? I'll reference to the custom deployment guides too.

[supertopher]

Thanks for the quick PR Marco. This looks great