Fix PR #43 (#44)

* Add files via upload

* Add RT Game Engine to showcase list

* Fix JSON formatting in index.html

* Remove duplicate RT Game Engine entry

Removed duplicate entry for RT Game Engine from the showcase array.

* Delete screenshots/rt_game_engine.gif

* Added a WebP version of the rt_game_engine GIF

WebP is more compressed than gif

* Update thumbnail image for RT Game Engine

Replaced the GIF with PNG and WebP for bandwidth

* Add files via upload

PNG fallback of thumbnail image for older browsers

Author: BlueLupa

index.html

@@ -369,12 +369,12 @@ <h1 class="title is-1"><a name="showcase">#</a> Showcase</h1>
                 "description": "Skybox example",
                 "website": "https://github.com/gfx-rs/wgpu/tree/trunk/examples/src/skybox",
                 "thumbnail": "screenshots/example-skybox.gif"
-            }
+            },
             {
                 "name": "RT Game Engine",
                 "description": "A game engine with real-time Ray Tracing and Physically Based Rendering (PBR)",
                 "website": "https://github.com/BlueLupa/RT-Game-Engine",
-                "thumbnail": "screenshots/rt_game_engine.gif"
+                "thumbnail": "screenshots/rt_game_engine.png"
             }
         ];