Want Chinese Version epub

**Is your feature request related to a problem? Please describe.** The release page currently only provides English versions of the book in epub and pdf formats. For users who prefer to read in Chinese, it can be inconvenient to always read the online web version. **Describe the solution you'd like** I would like the release page to also provide epub and pdf versions of the Chinese translation, so that readers can easily download and read them offline. **Describe alternatives you've considered** Manually converting the website content into epub/pdf, but this requires extra work for each update. **Additional context** N/A