Simplified Books section a bit more

index.html

@@ -77,9 +77,7 @@
 					<ul>
 						<li><a href="https://discoverthreejs.com/" target="_blank" rel="noopener">Discover Three.js</a></li>
 						<li><a href="https://www.packtpub.com/web-development/learn-threejs-third-edition" 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 第2版</a></li>
-						<li><a href="https://www.packtpub.com/web-development/threejs-cookbook" target="_blank" rel="noopener">Three.js Cookbook</a></li>
-						<li><a href="https://www.packtpub.com/web-development/threejs-essentials" target="_blank" rel="noopener">Three.js Essentials</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>
 					</ul>
 
 				</div>