Update more notebooks to be available on the website

[jackgerrits]

Why are these changes needed?

Adds the following to the website:

• agentchat_capability_long_context_handling.ipynb
• agentchat_chess.ipynb
• agentchat_compression.ipynb
• agentchat_custom_model.ipynb
• agentchat_groupchat_research.ipynb
• agentchat_teachability.ipynb
• agentchat_teaching.ipynb

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 37.30%. Comparing base (c75655a) to head (4e74bf3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1890   +/-   ##
=======================================
  Coverage   37.30%   37.30%           
=======================================
  Files          64       64           
  Lines        6910     6910           
  Branches     1519     1519           
=======================================
  Hits         2578     2578           
  Misses       4109     4109           
  Partials      223      223           

Flag	Coverage Δ
unittests	37.30% <ø> (ø)

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[rickyloynd-microsoft]

The new requirements section of agentchat_teachability.ipynb now looks like this:

Is that the expected formatting?

[jackgerrits]

Yes, that is expected. That renders as an admonition on the website

[rickyloynd-microsoft]

Looks great!

[sonichi]

Could you resolve the conflict?

[jackgerrits]

@sonichi resolved

[sonichi]

I see

[jackgerrits]

okay that one is resolved now too