Documentation preview for this PR (built with commit eed10dd; changes) is ready! 🎉

I can have a look at the Chinese content when this is ready, but it will be nice to have an extra reviewer for the other parts

Thanks!

Other than proofreading and updating the content (after 10 years...), I would need some help with the Chinese fonts for the PDF build (using lualatex).

Yes, I can see some mention of Sage 4.x, so it's best to update those :)

I don't know about LaTeX at all, but I just tried (on MacOS 13.4) lualatex and the following code works straightaway (modulo stupid missing fonts)

\documentclass{ctexart}
\begin{document}
Testing. 繁體中文 Traditional Chinese。简体中文 Simplified Chinese。
Oh and Happy Lunar New Year 新年快樂。
\end{document}