Added devtools link and refactored nav.

index.html

@@ -47,10 +47,14 @@
 					<ul>
 						<li><a href="manual/#en/creating-a-scene">documentation</a></li>
 						<li><a href="examples/#webgl_animation_keyframes">examples</a></li>
+						<li><a href="https://chromewebstore.google.com/detail/threejs-devtools/jechbjkglifdaldbdbigibihfaclnkbo">devtools</a></li>
+						<li><a href="https://chat.openai.com/g/g-jGjqAMvED-three-js-mentor">gpt</a></li>
+					</ul>
+
+					<h2>Play</h2>
+					<ul>
 						<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>
 
 					<h2>Community</h2>
@@ -69,7 +73,6 @@
 
 					<h2>Resources</h2>
 					<ul>
-						<li><a href="manual/#en/fundamentals" target="_blank" rel="noopener">Three.js Fundamentals</a></li>
 						<li><a href="https://threejs-journey.xyz/" target="_blank" rel="noopener">Three.js Journey</a></li>
 						<li><a href="https://www.packtpub.com/product/learn-threejs-fourth-edition/9781803233871" target="_blank" rel="noopener">Learn Three.js</a></li>
 						<li><a href="https://www.amazon.co.jp/初めてのThree-js-第2版-_WebGLのためのJavaScript-3Dライブラリ-Dirksen/dp/4873117704/" target="_blank" rel="noopener">初めてのThree.js</a></li>