[docs] Add OSS Skills Marketplace (#6752)

documentation/src/theme/Root.tsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { useEffect } from 'react';
 import type { ReactNode } from 'react';
 
 interface Props {
@@ -8,6 +8,13 @@ interface Props {
 const SHOW_BANNER = false;
 
 export default function Root({ children }: Props): JSX.Element {
+  // Initialize gtag as no-op if not present (prevents errors in development)
+  useEffect(() => {
+    if (typeof window !== 'undefined' && !window.gtag) {
+      (window as any).gtag = function() {};
+    }
+  }, []);
+
   return (
     <>
       {SHOW_BANNER && (