Update mainImage11 import to use WebP format

src/components/CarouselContainer/CarouselContainer.jsx

@@ -10,7 +10,7 @@ import mainImage5 from "../../assets/images/MAINHEADER-05.webp";
 import mainImage6 from "../../assets/images/MAINHEADER-06.webp";
 import mainImage8 from "../../assets/images/MAINHEADER-08.webp";
 import mainImage10 from "../../assets/images/MAINHEADER-10.png";
-import mainImage11 from "../../assets/images/MAINHEADER-11.jpg";
+import mainImage11 from "../../assets/images/MAINHEADER-11.webp";
 
 import mainImageMobile from "../../assets/images/mainwallpaper-mobile.jpg";
 import { Carousel } from 'react-responsive-carousel';