Filter out index.html files from directory listings

Exclude generated index.html files when building the directory tree to prevent them from appearing in the listings. Since the generator deploys index.html files to the same bucket, they would otherwise show up as regular files in subsequent runs.

generator.py

@@ -120,6 +120,11 @@ class DirectoryTree:
                 logger.debug(f"Skipping directory marker: {key}")
                 continue
 
+            # Skip generated index.html files
+            if parts[-1] == 'index.html':
+                logger.debug(f"Skipping generated index file: {key}")
+                continue
+
             # Handle files at root
             if len(parts) == 1:
                 self.files.append({