Styling intro screen and adding demo images.

src/missing-types.d.ts

@@ -1,22 +1,24 @@
-// PRs to fix this:
-// https://github.com/developit/preact/pull/1101
-// https://github.com/developit/preact/pull/1102
-declare namespace JSX {
-  type PointerEventHandler = EventHandler<PointerEvent>;
-
-  interface DOMAttributes {
-    onTouchStartCapture?: TouchEventHandler;
-    onTouchEndCapture?: TouchEventHandler;
-    onTouchMoveCapture?: TouchEventHandler;
-
-    onPointerDownCapture?: PointerEventHandler;
-
-    onMouseDownCapture?: MouseEventHandler;
-
-    onWheelCapture?: WheelEventHandler;
-  }
-}
-
 interface CanvasRenderingContext2D {
   filter: string;
 }
+
+// Handling file-loader imports:
+declare module '*.png' {
+  const content: string;
+  export default content;
+}
+
+declare module '*.jpg' {
+  const content: string;
+  export default content;
+}
+
+declare module '*.gif' {
+  const content: string;
+  export default content;
+}
+
+declare module '*.svg' {
+  const content: string;
+  export default content;
+}