[Documentation] Using non-OpenAI models

[marklysze]

As there's a lot of interest in running AutoGen with non-OpenAI models and there's a drive to add it to the documentation (#1994), here's a start to the documentation for using non-OpenAI models with cloud and local proxy servers.

There's a new menu item under Docs > Topics called Using Non-OpenAI Models.

Under this are the start of the documentation for using non-OpenAI models, with three pages:

1. Non-OpenAI Models (an introduction to using cloud and local proxy servers)
2. Cloud-based Proxy Servers (An example of a cloud proxy server, together.ai)
3. Locally Run Proxy Servers (An example of LiteLLM+Ollama)

I'll add vLLM to the locally run proxy servers and am also looking to add huggingface.co to the cloud-based (if I can get a working example).

It would be great for others to add examples for cloud-based and locally run proxy servers.

Adding custom model classes would also be a good additional page and examples.

Incorporating (#2044 - LM Studio example) by @ekzhu is necessary, too, and that has a matching folder structure.

Related issue number

1994 - [Documentation] Topic Category for AutoGen + Non-OpenAI Models is the driver for this PR.

2044 - Add LM Studio Example in Topics to be incorporated / merged.

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.

UPDATE

The current documentation structure is now:
Docs > Topics > Using Non-OpenAI Models

Under this is an introduction page and then individual pages for cloud-based and local proxy servers.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.90%. Comparing base (6d2c923) to head (b3ccbc7).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2076      +/-   ##
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+ Coverage   36.88%   36.90%   +0.01%     
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  Files          68       68              
  Lines        7062     7061       -1     
  Branches     1540     1541       +1     
==========================================
+ Hits         2605     2606       +1     
+ Misses       4228     4225       -3     
- Partials      229      230       +1     

Flag	Coverage Δ
unittests	36.90% <ø> (+0.01%)	⬆️

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[ekzhu]

Thanks for the PR! My comments are mostly about organizing the content into smaller parts for easier navigation and better indexibiity.

[ekzhu]

Thanks! To run pre-commit formatting check locally, you can do:

pre-commit run --all-files