feat(saas): Added Maintenance page (#27)

starterkits/saas/src/app/maintenance/page.tsx

@@ -1,3 +1,17 @@
+import { siteConfig } from "@/config/site";
+
 export default function Maintenance() {
-    return <div>Maintenance</div>;
+    return (
+        <main className="container flex min-h-screen w-screen flex-col items-center justify-center space-y-2">
+            <p className="fixed text-[15vw] font-bold opacity-5">Maintenance</p>
+
+            <h1 className="text-center text-3xl font-bold sm:text-5xl">
+                {siteConfig.name} is currently undergoing maintenance.
+            </h1>
+            <p className="text-center text-base text-muted-foreground sm:text-lg">
+                We&apos;re working hard to get everything back up and running.
+                In the meantime, you can check back later.
+            </p>
+        </main>
+    );
 }