merge frontend website into scripts repo

frontend/src/app/not-found.tsx

@@ -0,0 +1,20 @@
+"use client";
+import { Button } from "@/components/ui/button";
+
+export default function NotFoundPage() {
+  return (
+    <div className="flex h-screen w-full flex-col items-center justify-center gap-5 bg-background px-4 md:px-6">
+      <div className="space-y-2 text-center">
+        <h1 className="text-4xl font-bold tracking-tighter sm:text-5xl md:text-6xl">
+          404
+        </h1>
+        <p className="text-muted-foreground md:text-xl">
+          Oops, the page you are looking for could not be found.
+        </p>
+      </div>
+      <Button onClick={() => window.history.back()} variant="secondary">
+        Go Back
+      </Button>
+    </div>
+  );
+}