Add welcome component and update home route title

app/index.tsx

@@ -0,0 +1,8 @@
+export function Welcome() {
+  return (
+    <div>
+      <h1 className="text-3xl text-center">Welcome to Aindustries' casino</h1>
+      <p className="text-center">Mind that gambling isn't that dangerous</p>
+    </div>
+  );
+}