Add env-based site configuration

components/site-footer.tsx

@@ -1,8 +1,9 @@
+import { siteConfig } from '@/lib/config';
+
 export function SiteFooter() {
   return (
     <footer className="border-t py-4 text-center text-sm text-gray-500">
-      © {new Date().getFullYear()} Your Name
+      © {new Date().getFullYear()} {siteConfig.author}
     </footer>
   );
 }
-