First crack at the app. Still lots of bugs to squash.

src/main.ts

@@ -0,0 +1,9 @@
+import {mount} from 'svelte'
+import './app.css'
+import App from './App.svelte'
+
+const app = mount(App, {
+  target: document.getElementById('app')!,
+})
+
+export default app