minor UX change: change the gallery order so latest output is shown first

changes the gallery list to add the last output image to the beginning of the list so that it appears first

app.py

@@ -468,7 +468,8 @@ def generate(
 
     if gallery_images is None:
         gallery_images = []
-    gallery_images.append(image)
+    # gallery_images.append(image)
+    gallery_images = [image] + gallery_images # latest output to be at the top of the list
 
     return gallery_images, str(new_seed), int(new_seed)