fix(docs): links in Chinese translation

[novusnota]

This:

1. rg '\]: /' -r ']: /zh-ch/ to find all the []: /... links for their further replacement
2. rg --files 'zh-cn/**/*.mdx' | xargs sd -p, then copy-paste both '...' from step 1.

And this:

1. rg '\]\((/.*?\))' -r '](/zh-cn$1' to find all the [](/...) links for their further replacement
2. rg --files 'zh-cn/**/*.mdx' | xargs sd -p, then copy-paste both '...' from step 1.

Where rg is the ripgrep, which never modifies any files, and sd is, well, sd (not sed!). Since both use the same RegExp engine, they're quite convenient to use together.

Issue

Closes #1205.

Checklist

• I have updated CHANGELOG.md
• I have run the linter, formatter and spellchecker
• I did not do unrelated and/or undiscussed refactorings