📖 Add link to "clusterctl move" docs.

[guettli]

What this PR does / why we need it:

The details of "clusterctl move" are in the provider contract. A link to that helps new users.

[k8s-ci-robot]

Hi @guettli. Thanks for your PR.

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[sbueringer]

Thank you!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5baad6b0f89a7e0ef09a821c4220da587417a57b

[sbueringer]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[killianmuldoon]

/area documentation