fix: remove unused config.

Author: guangzhengli

.vitepress/config.mts

@@ -8,7 +8,6 @@ export default defineConfig({
     // https://vitepress.dev/reference/default-theme-config
     nav: [
       { text: 'Home', link: '/' },
-      { text: 'Examples', link: '/markdown-examples' }
     ],
 
     sidebar: [