fix(error): fix incorrect 'view on IMDb' link on error page

the error was due to a faulty logic. 'useRouter' was being used to detect pathname, which doesn't
keep original url on 404 page.
this commit fixes that.
this commit also makes it easy to go to
IMDb by adding a clear link on error page.

closes https://github.com/zyachel/libremdb/issues/50

next.config.mjs

@@ -2,21 +2,14 @@
 const nextConfig = {
   reactStrictMode: true,
   swcMinify: true,
-  async rewrites() {
-    return {
-      afterFiles: [
-        {
-          source: '/',
-          destination: '/find',
-        },
-      ],
-      fallback: [
-        {
-          source: '/:path*',
-          destination: '/404',
-        },
-      ],
-    };
+  async redirects() {
+    return [
+      {
+        source: '/',
+        destination: '/find',
+        permanent: true,
+      },
+    ];
   },
   images: {
     domains: ['m.media-amazon.com'],