category field added

implemented ctegory logic, ditional pages added

frontend/src/components/layout/Header.tsx

@@ -19,8 +19,11 @@ export function Header() {
   };
 
   const navLinks = [
-    { to: '/', label: 'Home' },
-    { to: '/articles', label: 'Articles' },
+    { to: '/', label: 'Почетна' },
+    { to: '/sport', label: 'Спорт' },
+    { to: '/art', label: 'Уметност' },
+    { to: '/science', label: 'Наука' },
+    { to: '/archive', label: 'Архива' },
     { to: '/live-blogs', label: 'Live' },
   ];