Autogen chart readme

[ritazh]

Describe the solution you'd like [A clear and concise description of what you want to happen.] Keep the chart readme in sync with the values.yaml as we introduce and update fields in values.yaml

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.]

Potential solutions: https://github.com/norwoodj/helm-docs

Environment:

• Gatekeeper version:
• Kubernetes version: (use kubectl version):

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