docs: change Chinese translation site link to make China Mainland accessible

[ifshizuku]

Description

Because the *.vercel.app domain was blocked by China Mainland firewall policy, I changed the link to another domain, thus enhanced the reading experience for Simplified Chinese users.

Thank you.

[netlify]

✅ Deploy Preview for shiki-next ready!

Name	Link
🔨 Latest commit	63e6673
🔍 Latest deploy log	https://app.netlify.com/sites/shiki-next/deploys/65fda1defd5c8e00088df268
😎 Deploy Preview	https://deploy-preview-634--shiki-next.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for shiki-matsu ready!

Name	Link
🔨 Latest commit	63e6673
🔍 Latest deploy log	https://app.netlify.com/sites/shiki-matsu/deploys/65fda1de8937b8000802c017
😎 Deploy Preview	https://deploy-preview-634--shiki-matsu.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.31%. Comparing base (398bed6) to head (63e6673).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #634   +/-   ##
=======================================
  Coverage   96.31%   96.31%           
=======================================
  Files          70       70           
  Lines        5699     5699           
  Branches      755      755           
=======================================
  Hits         5489     5489           
  Misses        205      205           
  Partials        5        5           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.