📖 Move clusterctl to book

[kikisdeliveryservice]

Move clusterctl to book
- moved docs/how-to-use-clusterctl.md to docs/book/src/tooling/clusterctl.md
- deleted docs/book/src/tooling/clusterctl.md
- remove ref to clusterctl.md from /hack/verify-doctoc.sh

Fixes: #1372

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[kikisdeliveryservice]

hmm in the original: https://github.com/kubernetes-sigs/cluster-api/blob/master/docs/how-to-use-clusterctl.md#what-is-clusterctl the link in provider implementations just goes to the repo itself?

Ok fixed in my version. :)

[kikisdeliveryservice]

@vincepri 2 questions (since I'm new here):

For this PR should I delete the existing how-to-user-clusterctl.md doc as well?

Should i update:

cluster-api/hack/verify-doctoc.sh

Line 26 in 1f6bf65

docs/how-to-use-clusterctl.md \

to include this file now?

[vincepri]

@kikisdeliveryservice It should be ok to remove the file and the reference as well, we should remove the TOC from the file given that the book doesn't require it

[vincepri]

/ok-to-test

[kikisdeliveryservice]

@kikisdeliveryservice It should be ok to remove the file and the reference as well, we should remove the TOC from the file given that the book doesn't require it

Thanks! Done.

[vincepri]

/approve
/assign @detiber

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kikisdeliveryservice, vincepri

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[kikisdeliveryservice]

Thanks @detiber I'll get those suggestions in later today. 😺

[kikisdeliveryservice]

Updated as per comments, @detiber and @vincepri PTAL.

[vincepri]

/lgtm