revert landing page (#4645)

Author: elalish

packages/modelviewer.dev/index.html

@@ -69,7 +69,7 @@ <h3 class="grouping-title grouping-title-new quick-start">Quick Start</h3>
 <script type="module" src="https://ajax.googleapis.com/ajax/libs/model-viewer/3.3.0/model-viewer.min.js"></script>
 
 <!-- Use it like any other HTML element -->
-<model-viewer alt="Neil Armstrong's Spacesuit from the Smithsonian Digitization Programs Office and National Air and Space Museum" src="shared-assets/models/MacbethBalls.glb" ar tone-mapping="commerce" environment-image="shared-assets/environments/spruit_sunrise_1k_HDR.jpg" poster="shared-assets/models/NeilArmstrong.webp" shadow-intensity="1" camera-controls touch-action="pan-y"></model-viewer>
+<model-viewer alt="Neil Armstrong's Spacesuit from the Smithsonian Digitization Programs Office and National Air and Space Museum" src="shared-assets/models/NeilArmstrong.glb" ar environment-image="shared-assets/environments/moon_1k.hdr" poster="shared-assets/models/NeilArmstrong.webp" shadow-intensity="1" camera-controls touch-action="pan-y"></model-viewer>
                 </template>
               </example-snippet>
             </div>