Some molecule links are broken in the docs

[everettraven]

When cutting the v1.28.1 release I ran into some docs link issues as shown by https://github.com/operator-framework/operator-sdk/actions/runs/4833286136/jobs/8613308800?pr=6412

We need to fix these links to make the docs link checker happy:

 - /target/docs/best-practices/common-recommendation/index.html
  *  External link https://molecule.readthedocs.io/en/latest/ failed: 404 No error
- /target/docs/building-operators/ansible/migration/index.html
  *  External link https://molecule.readthedocs.io/en/latest/# failed: 404 No error
- /target/docs/building-operators/ansible/reference/webhooks/index.html
  *  External link https://v1-21.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#mutatingwebhookconfiguration-v1-admissionregistration-k8s-io failed: response code 0 means something's wrong.
             It's possible libcurl couldn't connect to the server or perhaps the request timed out.
             Sometimes, making too many requests at once also breaks things.
             Either way, the return message (if any) from the server is: SSL peer certificate or SSH remote key was not OK
  *  External link https://v1-21.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#validatingwebhookconfiguration-v1-admissionregistration-k8s-io failed: response code 0 means something's wrong.
             It's possible libcurl couldn't connect to the server or perhaps the request timed out.
             Sometimes, making too many requests at once also breaks things.
             Either way, the return message (if any) from the server is: SSL peer certificate or SSH remote key was not OK
- /target/docs/building-operators/ansible/testing-guide/index.html
  *  External link https://molecule.readthedocs.io/en/latest/configuration failed: 404 No error
- /target/docs/upgrading-sdk-version/version-upgrade-guide/index.html
  *  External link https://molecule.readthedocs.io/en/latest/contributing/#linting failed: 404 No error

[ShivangiM]

Is someone working on it? If not, can I pick it up?
#6414