chore: fix demos

remove three – relates to pmndrs#1586

Author: joshuaellis

demo/src/App.jsx

@@ -25,7 +25,6 @@ import DecayRocket from './sandboxes/rocket-decay/src/App'
 import Parallax from './sandboxes/parallax/src/App'
 import ParallaxVert from './sandboxes/parallax-vert/src/App'
 import ParallaxSticky from './sandboxes/parallax-sticky/src/App'
-import SimpleThree from './sandboxes/simple-three/src/App'
 
 const links = {
   card: Card,
@@ -51,7 +50,6 @@ const links = {
   parallax: Parallax,
   'parallax-vert': ParallaxVert,
   'parallax-sticky': ParallaxSticky,
-  three: SimpleThree,
 }
 
 const Example = ({ link }) => {