added introductory prompt

backend.py

@@ -137,21 +137,21 @@ def handle_query(query_str: str,
         #response = chat_engine.chat(query_str)
 
         for token in response.response_gen:
-            if not token.startswith("system:") and not token.startswith("user:"):
-                if token.startswith("file_path:"):
-                    sources.append(token)
+            #if not token.startswith("system:") and not token.startswith("user:"):
+                #if token.startswith("file_path:"):
+                    #sources.append(token)
                 
                 outputs.append(token)
                 print(f"Generated token: {token}")
                 yield "".join(outputs)
 
-        if sources:
+        """if sources:
             sources_str = ", ".join(sources)
             outputs.append(f"Fonti utilizzate: {sources_str}")
         else:
             outputs.append("Nessuna fonte specifica utilizzata.")
 
-        yield "".join(outputs)
+        yield "".join(outputs)"""
 
 
     except Exception as e: