notebooks: Update 404 links for Notebooks v1 example images

[christian-heusel]

Description of Changes

Fix broken links to the example server images.

The move was done like so and verified via lychee:

sed -i "s|https://github.com/kubeflow/kubeflow/tree/master/components/example-notebook-servers|https://github.com/kubeflow/notebooks/tree/notebooks-v1/components/example-notebook-servers|g" content/en/docs/components/notebooks/container-images.md

These links went stale due to the repository move from
kubeflow/kubeflow into kubeflow/notebooks.

Related Issues

Closes: #4310

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