Examples: clean up (#32018)

* Examples: clean up

* Update webgpu_lights_projector.jpg

* updates

* update

---------

Co-authored-by: Samuel Rigaud <rigaud@gmail.com>
Co-authored-by: sunag <sunagbrasil@gmail.com>

examples/webgpu_lights_phong.html

@@ -43,7 +43,7 @@
 
 			let camera, scene, renderer,
 				light1, light2, light3, light4,
-				stats, controls;
+				controls;
 
 			init();
 

examples/webgpu_lights_rectarealight.html

@@ -42,7 +42,7 @@
 			import { RectAreaLightTexturesLib } from 'three/addons/lights/RectAreaLightTexturesLib.js';
 
 			let renderer, scene, camera;
-			let stats, meshKnot;
+			let meshKnot;
 
 			init();
 

examples/webgpu_postprocessing_bloom.html

@@ -17,8 +17,8 @@
 
 			<small>
 				Bloom pass by <a href="http://eduperiment.com" target="_blank" rel="noopener">Prashant Sharma</a> and <a href="https://clara.io" target="_blank" rel="noopener">Ben Houston</a>.<br/>
-				<a href="https://blog.sketchfab.com/art-spotlight-primary-ion-drive/" target="_blank" rel="noopener">Primary Ion Drive</a> by 
-				<a href="http://mjmurdock.com/" target="_blank" rel="noopener">Mike Murdock</a> is licensed under <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons Attribution</a>.<br />
+				<a href="https://blog.sketchfab.com/art-spotlight-primary-ion-drive/" target="_blank" rel="noopener">Primary Ion Drive</a>
+				by <a href="http://mjmurdock.com/" target="_blank" rel="noopener">Mike Murdock</a> is licensed under <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons Attribution</a>.<br />
 			</small>
 		</div>
 
@@ -59,8 +59,6 @@
 
 			async function init() {
 
-				const container = document.getElementById( 'container' );
-
 				clock = new THREE.Clock();
 
 				const scene = new THREE.Scene();

examples/webgpu_tonemapping.html

@@ -46,7 +46,7 @@
 			import { HDRLoader } from 'three/addons/loaders/HDRLoader.js';
 
 			let renderer, scene, camera, controls;
-			let gui, guiExposure = null;
+			let gui = null;
 
 			const params = {
 				exposure: 1.0,