Adds context path (url prefix, sub path) of Apache Superset by NGINX reverse proxy and sub_filter.
with awesome(default) context path
$ docker-compose up -d
or
with the context path mysuperset
$ SUPERSET_CONTEXT_PATH=mysuperset docker-compose up -d
$ docker exec -it prefixed_superset superset load_examples
http://localhost/awesome/superset/welcome/ or http://localhost/${SUPERSET_CONTEXT_PATH}/superset/welcome/
$ docker-compose down