re-add google tag manager

Author: LordSimal

.vitepress/config.js

@@ -21,6 +21,18 @@ const defaultConfig = {
     ['link', { rel: 'apple-touch-icon', sizes: '180x180', href: '/favicon/apple-touch-icon.png' }],
     ['meta', { name: 'apple-mobile-web-app-title', content: 'CakePHP' }],
     ['link', { rel: 'manifest', href: '/favicon/site.webmanifest' }],
+    [
+      'script',
+      { async: '', src: 'https://www.googletagmanager.com/gtag/js?id=G-MD3J6G9QVX' }
+    ],
+    [
+      'script',
+      {},
+      `window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+      gtag('config', 'G-MD3J6G9QVX', { 'anonymize_ip': true }));`
+    ]
   ],
   themeConfig: {
     logo: '/logo.svg',