Create topics dir and move llm config

[jackgerrits]

Why are these changes needed?

This creates a folder for the topics we will be adding. Starting with llm config, I will also place the jupyter exec docs in there.

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 36.03%. Comparing base (cd3b5c6) to head (40f5ca7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1853   +/-   ##
=======================================
  Coverage   36.03%   36.03%           
=======================================
  Files          63       63           
  Lines        6608     6608           
  Branches     1456     1456           
=======================================
  Hits         2381     2381           
  Misses       4036     4036           
  Partials      191      191           

Flag	Coverage Δ
unittests	36.03% <ø> (ø)

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