[Feature] Add docs for all the deepseek model

[zhaochenyang20]

Checklist

• 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
• 2. Please use English, otherwise it will be closed.

Motivation

Add it under https://sgl-project.github.io/references/. Gather all the optimization, usage, and parameters in one doc and name it deepseek.md. This can be a markdown, but please verify it locally as what you can.

Related resources

https://lmsys.org/blog/

[zhaochenyang20]

@XiaotongJiang Thanks for help!

[zhaochenyang20]

https://github.com/deepseek-ai/DeepSeek-V3?tab=readme-ov-file#6-how-to-run-locally

[zhaochenyang20]

https://github.com/sgl-project/sglang/tree/main/benchmark/deepseek_v3

[Xu-Chen]

Considering supporting deepseek-v3-gptq/awq?
https://huggingface.co/OPEA/DeepSeek-V3-int4-sym-gptq-inc-preview

[zhaochenyang20]

@Xu-Chen Raise an issue instead? This is only a document, but I think you need a feature to support?