Improve the admin experience, add more metadata to the list_display

- Don't propagate max_tokens to the openai chat completion method. the max for the newer models is fixed at 4096 max output. The token limit is just used for input

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

@@ -67,7 +67,6 @@ def extract_questions(
         messages=messages,
         model=model,
         temperature=temperature,
-        max_tokens=max_tokens,
         api_base_url=api_base_url,
         model_kwargs={"response_format": {"type": "json_object"}},
         openai_api_key=api_key,