add a AI chatbot, rename course names

deepseek_chatbot.py

@@ -12,7 +12,7 @@ with st.expander("See Source Code"):
                 st.code(f.read(), language="python")
 
 # Load API credentials from config.json
-with open('chatbot_config.json') as config_file:
+with open('app_config.json') as config_file:
     config = json.load(config_file)
     openai_api_base_url = config["api_url"]
     openai_api_key = config["api_key"]