modify some things to remove warnings on server and in browser console

src/components/World/World.js

@@ -37,7 +37,7 @@ class World {
     const controls = createControls(camera, renderer.domElement);
 
     // Light Instance, with optional light helper
-    const { light, lightHelper } = createLights(color);
+    const { light } = createLights(color);
 
     // Random values for terrain vertices
     // We could do this on the terrain.js file,