Add custom font styles and theme enhancements

- Created a new CSS file for font imports and defined font families for base, mono, strong, em, and h1 elements.
- Added a new JavaScript file to extend the default VitePress theme, incorporating a custom layout and a Vue component for enhanced functionality.
- Integrated Mermaid diagram support and included the necessary styles for it.

openwiki/templates/node.md

@@ -0,0 +1,21 @@
+---
+name: "{知识点}"
+description: "{知识点描述}"
+aliases: # 别名、同义词、缩写、全名、翻译名等
+  - {别称-1}
+  - {别称-2}
+tags: # 仅分类标签，如：解剖、蛋白、现象、机制、人物、公司、产品等
+  - {分类-1}
+  - ...
+created_at: {YYYY-MM-DD} # 页面创建时间
+updated_at: {YYYY-MM-DD} # 页面更新时间
+---
+
+# {知识点}
+
+<!-- 正文内容 -->
+
+## 相关资料
+
+- [{资料摘要}](../sources/{资料摘要}.md)
+- ...