docs: Update swh-docker-dev mentions to swh-environment/docker
We were still referencing the unmaintained swh-docker-dev repository.
Migrated from D2590 (view on Phabricator)
Staging instance, all changes can be removed at any time
We were still referencing the unmaintained swh-docker-dev repository.
Migrated from D2590 (view on Phabricator)