fix(seo): update Open Graph image path in index.md

Author: ManukMinasyan

docs/content/index.md

@@ -2,7 +2,7 @@
 seo:
   title: Filament/Livewire Kanban Boards
   description: Transform any Laravel model into production-ready drag-and-drop Kanban boards. Works with Filament admin panels and standalone Livewire applications.
-  ogImage: /preview.png
+  ogImage: /og-image.png
 ---
 
 ::u-page-hero