Update the suggested images in dss create-notebook --help to use rocks

[ca-scribner]

Why it needs to get done

The initial dss create-notebook --help text uses Kubeflow's upstream notebook servers as suggested images. Once we have our own rocks, we should update this help text to link our rocks.

What needs to get done

1. Update main.py with rock image links once available

When is the task considered done

1. when the help text uses canonical-published rocks

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5478.

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