fix: hide hero image on mobile — target correct VitePress .image class

Author: tanviet12

docs/.vitepress/theme/style.css

@@ -6,16 +6,9 @@
   box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
 }
 
-@media (max-width: 768px) {
-  .VPHero .image-container {
-    display: none;
-  }
-  .VPHero .container {
-    flex-direction: column;
-  }
-  .VPHero .main {
-    max-width: 100%;
-    text-align: center;
+@media (max-width: 959px) {
+  .VPHero.has-image .image {
+    display: none !important;
   }
 }