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/launchers.py

@@ -15,11 +15,6 @@ from typing import Optional
 import pendulum as pendulum
 from carta_envoy.connect import ArchiveConnect, NotificationConnect, RedisConnect
 from carta_envoy.templates import CartaWrapper
-from carta_envoy.utilities import (
-    CARTA_HTML_FILENAME,
-    CARTA_TEMPLATE,
-    CARTA_URL_REPLACE_TEXT,
-)
 from pendulum import DateTime
 
 # pylint: disable=E0401, R0913, R1721, W0603, W1203
@@ -259,22 +254,6 @@ class CartaLauncher:
         else:
             self.logger.warning("WARNING: CARTA not running.")
 
-    @staticmethod
-    def create_frame_html(carta_url: str, html_dir: Path) -> Path:
-        """
-        Generate the HTML page containing the CARTA URL in a frame.
-
-        :param carta_url: URL of CARTA session
-        :param html_dir: where HTML will be written
-        :return: HTML file we just created
-        """
-
-        new_content = CARTA_TEMPLATE.replace(CARTA_URL_REPLACE_TEXT, carta_url)
-        html_file = html_dir / CARTA_HTML_FILENAME
-        html_file.write_text(new_content)
-
-        return html_file
-
     @staticmethod
     def _calculate_timeout_date(timeout_minutes: int) -> DateTime:
         """