Add documentation for jupyter code executor

[jackgerrits]

Why are these changes needed?

Related issue number

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• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.82%. Comparing base (799a24e) to head (ba4d13f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1809       +/-   ##
===========================================
+ Coverage   36.03%   46.82%   +10.79%     
===========================================
  Files          63       63               
  Lines        6608     6618       +10     
  Branches     1456     1584      +128     
===========================================
+ Hits         2381     3099      +718     
+ Misses       4036     3270      -766     
- Partials      191      249       +58     

Flag	Coverage Δ
unittests	46.75% <100.00%> (+10.71%)	⬆️

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[ekzhu]

Do you think we can move this under website/docs/topics, the format of this notebook seems more suitable for a website display and the content is more suitable as a topics page.

[jackgerrits]

I agree, it should go there. We'll need to wait for the quarto bug to be fixed

[jackgerrits]

Will move it into place as soon as #1853 is merged