Refactor app structure and simplify team docs

scripts/publish_payment_app.sh

@@ -5,9 +5,7 @@ set -euo pipefail
 ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 APP_DIR="${ROOT_DIR}/frontend/apps/payment"
 TARGET_FILE="${ROOT_DIR}/incoming-files/served/payment.html"
-COMPARE_FILE="${ROOT_DIR}/incoming-files/payment.html"
 
 cp "${APP_DIR}/index.html" "${TARGET_FILE}"
-cp "${APP_DIR}/index.html" "${COMPARE_FILE}"
 
 echo "Published payment app source to ${TARGET_FILE}"