fix(404): add redirects for broken URLs and custom not-found page

- Add permanent redirects for /products/manoon to /products
- Strip malformed /contact suffix from product URLs
- Create custom branded 404 page with product navigation
- Add NotFound translations for en and sr locales

next.config.ts

@@ -5,6 +5,32 @@ const withNextIntl = createNextIntlPlugin();
 
 const nextConfig: NextConfig = {
   output: 'standalone',
+  async redirects() {
+    return [
+      // Fix malformed URLs with /contact appended to product slugs
+      {
+        source: '/:locale(en|sr)/products/:slug*/contact',
+        destination: '/:locale/products/:slug*',
+        permanent: true,
+      },
+      {
+        source: '/products/:slug*/contact',
+        destination: '/products/:slug*',
+        permanent: true,
+      },
+      // Redirect old/removed product "manoon" to products listing
+      {
+        source: '/:locale(en|sr)/products/manoon',
+        destination: '/:locale/products',
+        permanent: true,
+      },
+      {
+        source: '/products/manoon',
+        destination: '/products',
+        permanent: true,
+      },
+    ];
+  },
   async rewrites() {
     const rybbitHost = process.env.NEXT_PUBLIC_RYBBIT_HOST || "https://rybbit.nodecrew.me";
     return [