Remove secret loading of system prompt

test_launch.py

@@ -5,13 +5,9 @@ import os
 # to the Space's Secrets. Use same name as env vars here
 
 token_path = './secrets/openai_token.txt'
-prompt_path = './secrets/system_prompt.txt'
 
 with open(token_path, 'r') as f:
     os.environ['OPENAI_TOKEN'] = f.read()
 
-with open(prompt_path, 'r') as f:
-    os.environ['SYSTEM_PROMPT'] = f.read()
-
 import app # import after setting env var so app sees latest version
 app.main()