adapt github release template to skip start-docker.sh

Author: fm3

tools/create-gh-release.py

@@ -52,7 +52,6 @@ def extract_newest_changelog():
 
     release_header = f"""
 * [Docker Image](https://hub.docker.com/r/scalableminds/webknossos) `scalableminds/webknossos:{newest_version}` :whale:
-Run it via [`export DOCKER_TAG=="{newest_version}" && ./start-docker.sh`](https://github.com/scalableminds/webknossos#docker).
 * [Changelog](CHANGELOG.released.md#{newest_version_anchor}---{release_date})
 """.strip()