feat: switch CDN to webcache.cn for external assets

[xihale]

preview: https://zigcc.code.xihale.top/

[gemini-code-assist]

Summary of Changes

Hello @xihale, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the Content Delivery Network (CDN) source for several external JavaScript and CSS libraries, specifically KaTeX for mathematical rendering and Mermaid for diagramming. The change aims to optimize the delivery of these assets, potentially improving loading times and reliability for users by leveraging webcache.cn.

Highlights

• CDN Migration: External assets for KaTeX and Mermaid libraries are now loaded from cdnjs.webstatic.cn instead of mirrors.sustech.edu.cn.

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[gemini-code-assist]

Code Review

This pull request switches the CDN for external assets from mirrors.sustech.edu.cn to cdnjs.webstatic.cn. The changes are applied consistently across the layout file and the related documentation. This is a good improvement, likely for performance and accessibility. I've added one suggestion to improve maintainability by centralizing the new CDN URL.

[suyuhan712]

Amazing