feat: optimize images and update dependencies

- Added image optimization script using sharp to reduce image sizes.
- Updated package.json to include sharp as a dependency.
- Modified build script to run image optimization before building.
- Added new sitemap.xml and robots.txt for better SEO.
- Updated multiple image files in public and images directories.

components/navbar.tsx

@@ -26,6 +26,7 @@ const Navbar = ({ darkMode = false }: NavbarProps) => {
     }, [])
 
     return (
+        <>
             <nav
                 className={cn(
                     "fixed top-0 left-0 right-0 z-50 transition-all duration-300 px-6 py-4",
@@ -146,10 +147,13 @@ const Navbar = ({ darkMode = false }: NavbarProps) => {
                 </button>
             </div>
 
+            </nav>
+
             {/* Mobile Menu Overlay */}
             {isMenuOpen && (
-                <div className="fixed inset-0 bg-slate-900 z-40 flex flex-col pt-32 px-8 animate-in slide-in-from-top duration-300">
+                <div className="fixed inset-0 z-40 flex flex-col pt-32 px-8 animate-in slide-in-from-top duration-300">
-                    <div className="flex flex-col space-y-6 text-center">
+                    <div className="absolute inset-0 bg-slate-950/95 backdrop-blur-md" />
+                    <div className="relative flex flex-col space-y-6 text-center">
                         <Link onClick={() => setIsMenuOpen(false)} href="/arak" className="text-2xl font-bold text-white hover:text-primary transition-colors">{t.nav.prices}</Link>
                         <Link onClick={() => setIsMenuOpen(false)} href="/szolgaltatasok" className="text-2xl font-bold text-white hover:text-primary transition-colors">{t.nav.services}</Link>
                         <Link onClick={() => setIsMenuOpen(false)} href="/feltetelek" className="text-2xl font-bold text-white hover:text-primary transition-colors">{t.nav.conditions}</Link>
@@ -169,7 +173,7 @@ const Navbar = ({ darkMode = false }: NavbarProps) => {
                     </div>
                 </div>
             )}
-        </nav>
+        </>
     )
 }