updated default entrypoint

ref #108

src/main.js

@@ -0,0 +1,9 @@
+import 'windi.css';
+import "toastify-js/src/toastify.css";
+import "gridjs/dist/theme/mermaid.css";
+import App from './App.svelte';
+
+const app = new App({
+	target: document.body
+});
+export default app;