WS-592: Simple HTML CARTA wrapper for elegant expiration on countdown

• Modified carta_envoy to serve CARTA wrapped in a simple HTML countdown clock that dies elegantly to improve the UX when the timeout expires
• Unit tests
• Tested on dev
• Tested with AAT

apps/cli/executables/pexable/carta_envoy/carta_envoy/carta.py

@@ -5,9 +5,9 @@ import os
 import sys
 from pathlib import Path
 from typing import Dict
-from pycapo import CapoConfig
 
 from carta_envoy.launchers import CartaLauncher
+from pycapo import CapoConfig
 
 # pylint: disable=C0301, E0401, W0622, W1203