Fix some mistakes in generation of galleries

Herisson/index.html.j2

                 <div class="galleries">
                     {% for gallery in galleries -%}
                         <div class="gallery-cover">
-                            <a href="{{ gallery.url }}.html">
+                            <a href="{{ gallery.url }}">
                                 <img src="{{ gallery.cover_photo.thumb_url }}" alt="" />
                                 <span class="gallery-cover-name">
                                     {{ gallery.name }}

boop.py

         gallery = {
             "name": gallery_dir.name,
             "path": gallery_dir.path,
-            "url": gallery_dir.name,
+            "output_path": gallery_dir.name,
+            "url": f"{gallery_dir.name}.html",
             "num_photos": len(photos),
             "photos": photos,
             "cover_photo": photos[cover_index],
 
 
 def generate_gallery_index(output_path, gallery):
-    gallery_index_path = os.path.join(output_path, f"{gallery['name']}.html")
+    gallery_index_path = os.path.join(output_path, f"{gallery['url']}")
 
     theme_path = os.path.join(os.curdir, THEME)
     jinja_env = Environment(
 
 
 def generate_gallery_dir(output_path, gallery):
-    gallery_output_path = os.path.join(output_path, gallery["name"])
+    gallery_output_path = os.path.join(output_path, gallery["output_path"])
     if not os.path.isdir(gallery_output_path):
         os.mkdir(gallery_output_path)