[Doc] Enhance documentation around CPU container images

[nathan-weinberg]

Supercedes #31749

Adds a bit more detail around building and pulling CPU container images

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• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
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[mergify]

Documentation preview: https://vllm--32286.org.readthedocs.build/en/32286/

[gemini-code-assist]

Code Review

This pull request enhances the documentation for CPU container images by adding instructions for building a CPU-only image and pulling pre-built CPU images. The changes are clear and helpful. I've found one minor issue in the provided build command example where an irrelevant build argument is mentioned, which could confuse users. I've suggested its removal.

[fadara01]

Great docs improvement!

Please see my comments and add Arm related docs/info where relevant, similar to what you do for x86

[nathan-weinberg]

@fadara01 updated based on your comments, but we can continue to hold this #32032 merges and then I will update the various links to point at Docker Hub rather than the ECR endpoint

[fadara01]

LGTM, thank you!

[mergify]

Hi @nathan-weinberg, the pre-commit checks have failed. Please run:

uv pip install pre-commit
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pre-commit run --all-files

Then, commit the changes and push to your branch.

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pre-commit run --hook-stage manual mypy-3.10
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[fadara01]

LGTM, just a minor comment for clarity and my own learning