[Beta] docs(cn): translate learn/index into Chinese

[x-cold]

No description provided.

[culome]

Approve.

[culome]

添加翻译者和Reviewer名字。

[KnowsCount]

@x-cold 我最后看了一遍，应该只有我刚刚提的两个问题了。感谢！
如果你能把 conflicts 给 resolve 掉应该就可以合并了。

[github-actions]

Size Changes

Details

📦 Next.js Bundle Analysis

This analysis was generated by the next.js bundle analysis action 🤖

One Page Changed Size

The following page changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/learn	58.88 KB (🟡 +1.06 KB)	143.1 KB

Details

Only the gzipped size is provided here based on an expert tip.

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