fix entête de la page grenier

_pages/grenier/index.md

@@ -34,8 +34,8 @@ gallery-concert-salle-po:
   Historique du CCL - Centre Culturel de Luminy et du campus. Animations, Festivals, Ateliers, Concerts, Jam, Dub
 has_header: true
 header:
-    type: overlay
-    overlay_image: assets/images/banniere-bulles.png
+  type: image
+  fixed_image: assets/images/banniere-puget-orange.jpg
 
 ---
 <!-- https://mmistakes.github.io/minimal-mistakes/docs/helpers/#gallery -->