Fix/refresh state

[Nexisato]

No description provided.

[gemini-code-assist]

Code Review

This pull request refactors the documentation's internal links to support clean URLs by removing '.md' and '.html' extensions, standardizing language prefixes, and updating the 'nginx.conf' file to handle these redirects and caching headers. The feedback suggests using a 301 permanent redirect instead of a 302 temporary redirect in 'nginx.conf' for the '/zh' paths, correcting a typo ('Swabnlab' to 'SwanLab') and a Chinese full-width period in the markdown files, and removing the '.md' extension from two missed links in the migration guide to ensure consistency.

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