https://docs.manim.org.cn 文件中影片連結失效

### Describe the bug
https://mkcdn.tonycrane.cc 網域的憑證過期了，導致https://docs.manim.org.cn 文件中的所有影片連結失效
The certificate of the https://mkcdn.tonycrane.cc domain has expired, causing all video links in the https://docs.manim.org.cn file to become invalid.

**Code**:
N/A

**Wrong display or Error traceback**:
N/A