Add GA to documentation

Author: nick-keller

website/docusaurus.config.js

@@ -59,4 +59,12 @@ module.exports = {
       },
     ],
   ],
+  plugins: [
+    [
+      '@docusaurus/plugin-google-gtag',
+      {
+        trackingID: 'UA-141789564-1',
+      },
+    ],
+  ],
 }