Eliminar modo standalone y simplificar variables a solo ADMIN_TOKEN y TZ

docker-compose.override.traefik.yml.example

@@ -8,10 +8,8 @@
 #     - Compose path: docker-compose.yml
 #     - Additional paths: docker-compose.override.traefik.yml.example
 #     - Environment variables:
-#         DOMAIN=https://vaultwarden.tudominio.com
 #         DOMAIN_HOST=vaultwarden.tudominio.com
 #         ADMIN_TOKEN=tu_token_admin_seguro
-#         SIGNUPS_ALLOWED=false
 #
 #   Desde CLI:
 #     1. Copia este archivo a docker-compose.override.yml