Remove user docs from the repo

[jistr]

The repo will only have developer docs and adoption tests from now on. The asciidoc user docs would no longer be considered as a source of truth and as such keeping them around would be net negative, resulting in doubling docs maintenance work, and confusion about which docs should be tested by the test suite.

This is a preparation which will be on hold until the docs migration happens. I will rebase the PR then.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[jistr]

/hold

[openshift-ci]

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[centosinfra-prod-github-app]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/data-plane-adoption for 1444,92f8009ebbdae7ee435af10b33f381b6f7e300cc

[jistr]

Hmm i guess i have to unhold to get the CI to run?
/unhold