feat: update configuration, styles, and components for improved UI and functionality

src/app/not-found.tsx

@@ -0,0 +1,18 @@
+import { Button } from "@/components/ui/button";
+import Image from "next/image";
+
+export default function NotFound() {
+    return (
+        <div className="flex flex-col items-center justify-center min-h-screen">
+            <figure>
+                <picture className="block bg-gray-100 rounded-xl aspect-1-1 overflow-hidden image-scale object-shadowed mb-8">
+                    <Image src="https://api.imnya.ng/mitda/miku" width={200} height={200} alt="Not Found Image" />
+                </picture>
+            </figure>
+            <h1 className="text-4xl font-bold">404</h1>
+            <p>괜찮아요. 이런날도 있는거죠</p>
+            <br/>
+            <a href="/">← Go Home</a>
+        </div>
+    )
+}