Update frontend.md

Author: pareenaverma

content/learning-paths/servers-and-cloud-computing/rag/frontend.md

@@ -20,7 +20,7 @@ from PIL import Image
 from typing import Dict, Any
 
 # Configure paths and URLs
-BASE_PATH = "/home/ubuntu"
+BASE_PATH = "$HOME"
 API_URL = "http://localhost:5000"
 
 # Page config
@@ -139,4 +139,4 @@ python3 -m streamlit run frontend.py
 ```
 
 You should see output similar to the image below when the frontend server starts successfully:
-![frontend](frontend_output.png)
+![frontend](frontend_output.png)