refactor: refactor docs website based on Astro Starlight Rapide theme.

[XuZhang99]

No description provided.

[gemini-code-assist]

Code Review

This pull request migrates the project's documentation framework from MkDocs to Astro/Starlight, updating repository links, assets, and configuration files accordingly. The reviewer noted that several essential feature documents—specifically ppmatmul, topk_topp, basics, overview, and groupgemm—were deleted during the transition and not migrated to the new directory structure in either English or Chinese, resulting in a significant loss of documentation content.

I am having trouble creating individual review comments. Click here to see my feedback.

docs/en/features/ppmatmul.md (1-36)

The documentation for ppmatmul.md was removed in the English version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/zh/features/ppmatmul.md (1-36)

The documentation for ppmatmul.md was removed in the Chinese version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/en/features/topk_topp.md (1-27)

The documentation for topk_topp.md was removed in the English version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/zh/features/topk_topP.md (1-27)

The documentation for topk_topP.md was removed in the Chinese version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/en/features/basics.md (1-5)

The documentation for basics.md was removed in the English version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/zh/features/basics.md (1-9)

The documentation for basics.md was removed in the Chinese version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/en/features/overview.md (1-51)

The documentation for overview.md was removed in the English version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/zh/features/overview.md (1-57)

The documentation for overview.md was removed in the Chinese version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/en/features/groupgemm.md (1-40)

The documentation for groupgemm.md was removed in the English version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.

docs/zh/features/groupgemm.md (1-41)

The documentation for groupgemm.md was removed in the Chinese version and not migrated to the new documentation structure. This results in a loss of documentation for this feature.