Extract Jellyfin thumbnails as a module

src/main/resources/application.yaml.example

@@ -30,4 +30,8 @@ api:
       - path: / # Root corresonds to the endpoint /file/
         roles: {} # Only users with these roles will have access to this route (empty = ALL)
   folder:
-    tokens: {} # List of tokens to make some routes available trhough the public folders API
+    tokens: {} # List of tokens to make some routes available trhough the public folders API
+  
+  # thumbnail:
+  #   jellyfin:
+  #     paths: {}