Move doc/ and examples to moveit2_tutorials

[AdamPettinger]

Description

See moveit/moveit2_tutorials#89 and conversation there. Moving the documentation and example executables and launch files to that repo

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[AndyZe]

This is nice. It will make build times faster for everybody and it really belongs in the tutorials anyway.

[AndyZe]

I think README.md should be updated, though. Since the files it refers to are getting moved.

[AdamPettinger]

The tutorials PR was merged, and the Foxy Servo tutorial is live!

[codecov]

Codecov Report

Merging #486 (a11565a) into main (2ec3e9d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #486   +/-   ##
=======================================
  Coverage   46.65%   46.65%           
=======================================
  Files         183      183           
  Lines       19654    19654           
=======================================
  Hits         9168     9168           
  Misses      10486    10486           

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