add google tag manager

Author: bretesq

.vitepress/config.mts

@@ -4,7 +4,18 @@ import { withMermaid } from "vitepress-plugin-mermaid";
 // https://vitepress.dev/reference/site-config
 export default withMermaid({
   title: "immy.bot",
-  head: [['link', { rel: 'icon', href: '/favicon.ico' }]],
+  head: [
+    ['link', { rel: 'icon', href: '/favicon.ico' }],
+    ['script', { async: '', src: 'https://www.googletagmanager.com/gtag/js?id=GTM-PF34XF88' }],
+    [
+      'script',
+      {},
+      `window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+      gtag('config', 'GTM-PF34XF88');`
+    ]
+  ],
   description: "A documentation suite for all things ImmyBot",
   sitemap: {
     hostname: 'https://docs.immy.bot'