[doc] add doc to explain how to use uv

[youkaichao]

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[github-actions]

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[mgoin]

If you want to include an impressive quickstart, you could recommend the user to try uvx to install and launch vllm with a single command:

uvx --python 3.12 vllm serve Qwen/Qwen2.5-0.5B-Instruct

[youkaichao]

If you want to include an impressive quickstart, you could recommend the user to try uvx to install and launch vllm with a single command:

uvx --python 3.12 vllm serve Qwen/Qwen2.5-0.5B-Instruct

I prefer to keep it simple, add uv as a drop-in replacement of conda and pip.

[youkaichao]

@mgoin @DarkLight1337 ready to review again.