feat: 增加中文文档（Add Chinese documents）

### Describe Problem

Describe Problem
The Chinese [community translation project in crowdin](https://crowdin.com/project/ionic-docs) is 100% complete.
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But there is still no option to switch to Chinese in the [Documents page](https://ionicframework.com/docs).
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Describe Preferred Solution
The Chinese language option should appear in the language switching options in the [Documents page](https://ionicframework.com/docs).
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Describe Alternatives
No response

Additional Information
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### Describe Preferred Solution

_No response_

### Describe Alternatives

_No response_

### Additional Information

_No response_