Add an optimization doc on TPU

[bvrockwell]

Creating a place in the docs for TPU optimization tips, WIP

[github-actions]

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[gemini-code-assist]

Code Review

This pull request adds a new documentation page with optimization tips for using vLLM on TPUs. The content is valuable and well-structured. I've identified a few issues, mainly related to broken or fragile links and a missing image, which could impact the user experience. I've also found a typo in a command-line argument that could cause issues for users who copy-paste it. Please see my detailed comments.

[bvrockwell]

@Chenyaaang @yaochengji ptal