🔥 Remove unused env var

Author: tiangolo

{{cookiecutter.project_slug}}/.env

@@ -13,4 +13,3 @@ TRAEFIK_PUBLIC_TAG={{cookiecutter.traefik_public_constraint_tag}}
 DOCKER_IMAGE_BACKEND={{cookiecutter.docker_image_backend}}
 DOCKER_IMAGE_CELERYWORKER={{cookiecutter.docker_image_celeryworker}}
 DOCKER_IMAGE_FRONTEND={{cookiecutter.docker_image_frontend}}
-DOCKER_IMAGE_SYNC_GATEWAY={{cookiecutter.docker_image_sync_gateway}}