Support Chinese Docs

[hiyuchang]

Description

As the title says.

Checklist

Please check the following items before code is ready to be reviewed.

• Code has passed all tests
• Docstrings have been added/updated in Google Style
• Documentation has been updated
• Code is ready for review

[gemini-code-assist]

Summary of Changes

Hello @hiyuchang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the project's documentation by adding comprehensive support for the Chinese language. It involves creating a dedicated set of documentation files in Chinese, implementing a user-friendly language switcher for navigation, and updating the underlying build system to correctly generate and manage both English and Chinese versions of the documentation. These changes are crucial for expanding the project's reach and usability for a global audience.

Highlights

• Chinese Documentation Added: Introduced a complete set of Chinese documentation, including tutorials, API references, and a main overview, making the project accessible to a Chinese-speaking audience.
• Language Switcher Implementation: Added a functional language toggle button to the documentation header, allowing users to seamlessly switch between English and Chinese versions of the content.
• Documentation Build Process Refactored: The build_doc.sh script has been significantly updated to support building both English and Chinese documentation into separate language-specific output directories, improving the multi-language build workflow.
• Sphinx Configuration and Directory Restructuring: Modified existing Sphinx configuration files and added new ones specifically for Chinese documentation, alongside a restructuring of documentation directories to accommodate the multi-language setup.

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[gemini-code-assist]

Code Review

This pull request introduces support for Chinese documentation by adding a parallel source tree, updating the build script, and implementing a language switcher. The overall approach is sound, particularly the refactoring of the build script to handle multiple languages cleanly. However, there are a few areas for improvement. The new build script contains a minor syntax error. The JavaScript for the language switcher uses dated syntax. There is significant code duplication between the English and Chinese Sphinx configuration files, which could be refactored for better maintainability. Most critically, the new Chinese documentation uses hardcoded absolute URLs that point to the English version of the site, which would create a confusing experience for users.