Fix React API reference link (#48)

Point the React entry at the official developer site instead of
the stale Vercel deployment.

Made-with: Cursor

Author: willeastcott

index.html

@@ -801,7 +801,7 @@ <h3>📖 Editor</h3>
                             <li class="module-item" data-name="react">
                                 <h3>📖 React</h3>
                                 <p>Use React’s declarative power to build PlayCanvas apps with components, hooks, and JSX.</p>
-                                <a href="https://playcanvas-react.vercel.app/docs/api" class="module-link external">View API Reference</a>
+                                <a href="https://developer.playcanvas.com/user-manual/react/api" class="module-link external">View API Reference</a>
                             </li>
                             <li class="module-item" data-name="web-components">
                                 <h3>📖 Web Components</h3>