Deprecate gazebo_ros2_control on rolling (backport #314)

[mergify]

Rolling CI fails because rolling is not released to jammy, but osrf/ros:rolling-desktop-full still uses jammy.

But even if it will be updated to noble it will fail because there is no gazebo classic release any more.

---

This is an automatic backport of pull request #314 done by Mergify.

[mergify]

Cherry-pick of fbb4393 has failed:

On branch mergify/bp/humble/pr-314
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit fbb4393.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   README.md
	modified:   doc/index.rst

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: .github/workflows/ci-rolling.yaml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally