docs: clarify registry addon workaround for cri-o

[iacker]

Summary

• clarify that the existing localhost:5000 registry addon workflow is Docker-oriented
• document the CRI-O workaround of using the in-cluster registry Service IP and port 80 in workload image references
• point readers to the image pushing handbook for workflows that avoid relying on a dynamic Service IP

Validation

• cd site && npm ci
• independent content review against the issue discussion and existing registry docs
• note: no dedicated site build target was available via make -C site build in this checkout

Fixes #6982

[k8s-ci-robot]

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[k8s-ci-robot]

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[minikube-bot]

Can one of the admins verify this patch?

[k8s-triage-robot]

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