Limit the number of historical document versions

[pan-x-c]

Description

To aviod compilation timeouts.

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 @pan-x-c, 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This pull request aims to prevent compilation timeouts during the documentation build process by limiting the number of historical document versions that are processed. By reducing the scope of included versions, the documentation generation should become more efficient and less prone to timeouts.

Highlights

• Reduced Historical Document Versions: The number of historical document versions included in the Sphinx documentation build has been reduced from 4 to 2.

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[gemini-code-assist]

Code Review

This pull request reduces the number of historical document versions to be built from 4 to 2, aiming to prevent compilation timeouts. The change is straightforward, but I've suggested extracting the hardcoded number of versions into a named constant to improve code clarity and maintainability.