* Addition of Non-OpenAI LLM section and main doc page
* Continued writing...
* Continued writing - cloud-based proxy servers
* Folder renamed
* Further writing
* together.ai example added
* Local proxy server added, diagram added, tidy up
* Added vLLM to local proxy servers documentation
* As per @ekzhu's feedback, individual pages and tidy up
* Added reference to LM Studio and renamed file
* Fixed incorrect huggingface.co link
* Run pre-commit checks, added LM Studio redirect
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Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>