cmctl

[JoshVanL]

From #715

This PR adds a page for the new cmctl CLI. This page mostly replaces the existing kubectl-plugin page taking the same content but changing the commands and some wording.

The exiting kubectl-plugin page has been stripped down to just installing and linking to cmctl.

Users can still find all the docs they need, but moving the docs this way helps nudge users into using cmctl which has a better UX.

/assign @jakexks

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[netlify]

✔️ Deploy Preview for cert-manager-website ready!

🔨 Explore the source changes: 46972c9

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😎 Browse the preview: https://deploy-preview-728--cert-manager-website.netlify.app/docs/installation/cmctl

[jakexks]

v1.5-docs/usage/certificate/index.html
  hash does not exist --- v1.5-docs/usage/certificate/index.html --> ../../../docs/usage/kubectl-plugin/#renew
  hash does not exist --- v1.5-docs/usage/certificate/index.html --> ../../../docs/usage/kubectl-plugin/#renew

Not sure if I missed any discussion in the large slack thread from yesterday, does this need still fixing in the release-1.5 branch?

/retest
/assign @JoshVanL

[maelvls]

Hi. I left a couple of suggestions that aren't blocking.

[JoshVanL]

/retest

[maelvls]

/lgtm