[docs] Translate the documentation to Chinese / 将文档翻译成中文?

### Summary / 总结

There is a huge community of Chinese developers.

But very few actually speak English, likely fewer than 10%:
- https://www.quora.com/What-of-Chinese-speak-English
- https://en.wikipedia.org/wiki/List_of_languages_by_total_number_of_speakers

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So translating the docs could be a great growth opportunity, especially for Base UI, which is not design-dependent.

### Examples / 例子

- https://recharts.github.io/zh-CN/
- https://www.qt.io/zh-cn/
- https://github.com/petyosi/react-virtuoso/issues/1317

### Context / 语境

- https://mui-org.notion.site/Docs-localization-what-s-next-3f370280b58f446fbb5559dfc08fe03e
- The laziest path that I can think of where this would happen is:

1. We wait for the community to translate Base UI, e.g., as they did in https://radix.nodejs.cn/primitives/docs
2. We see that the user experience is poor because it's done disjointly, leading to low adoption rates.
3. We see business value from the Chinese community.

=> If we ever reach that stage, it feels like it would be very easy to prioritize.