add homepage (#5)

Co-authored-by: Jan-Marlon Leibl <jleibl@proton.me>
Reviewed-on: http://git.simonis.lol/sites/abiball/pulls/5
Reviewed-by: Hop In, I Have Puppies AND WiFi <jleibl@noreply@simonis.lol>
Co-authored-by: Constantin Simonis <constantin@simonis.lol>
Co-committed-by: Constantin Simonis <constantin@simonis.lol>

assets/app.js

@@ -0,0 +1,9 @@
+/*
+ * Welcome to your app's main JavaScript file!
+ *
+ * This file will be included onto the page via the importmap() Twig function,
+ * which should already be in your base.html.twig.
+ */
+import './styles/app.css';
+
+console.log('This log comes from assets/app.js - welcome to AssetMapper! 🎉');