Add warning and reorder jupyter executor docs

[jackgerrits]

Why are these changes needed?

The idea is to suggest usage of Docker and warn for local

Related issue number

Checks

• 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 37.09%. Comparing base (e9219fe) to head (c62c1ed).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1908   +/-   ##
=======================================
  Coverage   37.09%   37.09%           
=======================================
  Files          64       64           
  Lines        6786     6786           
  Branches     1491     1491           
=======================================
  Hits         2517     2517           
  Misses       4061     4061           
  Partials      208      208           

Flag	Coverage Δ
unittests	37.09% <ø> (ø)

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