Move all app files to app dir and update dockerfile

Dockerfile

@@ -11,7 +11,7 @@ COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy the client code into the container
-COPY client.py .
+COPY .app .
 
 # Define environment variable for the server host
 # This will be set by the Makefile when running the container