site: update the registry docs to use the config map

[nicks]

I still think it's worth having a native way to do this in Kind (as per #1543 and #1213) but for now I'm just updating the docs to match current best practices

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: nicks
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[BenTheElder]

/ok-to-test

[BenTheElder]

sorry for the delay and thank you!

[nicks]

Yay thanks @BenTheElder !