📖 Fix: move v2vsv3.md to the legacy folder and update references

[monteiro-renato]

Currently broken here: https://book.kubebuilder.io/migration/legacy/v2vsv3

[k8s-ci-robot]

Hi @monteiro-renato. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[camilamacedo86]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, monteiro-renato

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