Small improvements:

- Switch to CodeMirror
- Switch to Parcel Bundler
- Fix synchronisation bug
- Update dependencies

src/types.d.ts

@@ -1,13 +1,3 @@
-declare module "*.svg" {
-    const SVG: (props: {
-        width?: number | undefined
-        height?: number | undefined
-        onClick?: (evt: MouseEvent) => void;
-        style?: string;
-    }) => JSX.Element;
-    export default SVG;
-}
-
 interface Window {
-    debug: any;
-}
+   debug: any;
+}