Add link to nodes editor.

Author: mrdoob

index.html

@@ -48,6 +48,7 @@ <h2>Learn</h2>
 						<li><a href="docs/index.html#manual/introduction/Creating-a-scene">documentation</a></li>
 						<li><a href="examples/#webgl_animation_keyframes">examples</a></li>
 						<li><a href="editor/">editor</a></li>
+						<li><a href="playground/">nodes</a></li>
 						<li><a href="https://chat.openai.com/g/g-jGjqAMvED-three-js-mentor">gpt</a></li>
 						<!-- <li><a href="playground/">nodes</a> (wip)</li> -->
 					</ul>