Improve format of notes, online context passed to chat models in prompt

Improve separation of note snippets and show its origin file in notes
prompt to have more readable, contextualized text shared with model.

Previously the references dict was being directly passed as a string.
The documents don't look well formatted and are less intelligible.

- Passing file path along with notes snippets will help contextualize
  the notes better.
- Better formatting should help with making notes more readable by the
  chat model.

src/khoj/processor/conversation/openai/gpt.py

@@ -143,9 +143,8 @@ def converse(
     """
     # Initialize Variables
     current_date = datetime.now()
-    compiled_references = "\n\n".join({f"# {item['compiled']}" for item in references})
-
     conversation_primer = prompts.query_prompt.format(query=user_query)
+    compiled_references = "\n\n".join({f"# File: {item['file']}\n## {item['compiled']}\n" for item in references})
 
     if agent and agent.personality:
         system_prompt = prompts.custom_personality.format(