Bulk rename ws_moveit2 --> ws_moveit (backport #411)

[mergify[bot]]

This is an automatic backport of pull request #411 done by Mergify. Cherry-pick of 4c408fbe0218c6bf4062c4dc090b8e8c8c3062bd has failed:

On branch mergify/bp/galactic/pr-411
Your branch is up to date with 'origin/galactic'.

You are currently cherry-picking commit 4c408fb.
  (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:   doc/examples/mobile_base_arm/mobile_base_arm_tutorial.rst
	modified:   doc/how_to_contribute/how_to_contribute_to_site.rst

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   doc/tutorials/getting_started/getting_started.rst
	deleted by us:   doc/tutorials/pick_and_place_with_moveit_task_constructor/pick_and_place_with_moveit_task_constructor.rst
	deleted by us:   doc/tutorials/visualizing_in_rviz/visualizing_in_rviz.rst
	deleted by us:   doc/tutorials/your_first_project/your_first_project.rst

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

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[mergify[bot]]

This pull request is in conflict. Could you fix it @mergify[bot]?