1. Creating venvs/docker images for dvcs loaders:
- [x] D8500: swh.loader.mercurial
- [x] swh.loader.cvs
- [x] swh.loader.svn
2. Reference loader in staging charts:
- [x] D8501: mercurial
- [x] loader-cvs
- [x] loader-svn
- [x] loader-archive
- [x] loader-cran
- [x] loader-debian
- [x] loader-deposit
- [x] loader-nixguix
- [x] loader-opam
- [x] remaining (staging) listers
3. Decomission loader in staging static workers:
- [x] loader-archive
- [x] loader-cran
- [x] loader-cvs
- [x] loader-debian
- [x] loader-deposit
- [x] loader-svn
- [x] loader-git
- [x] loader-bzr
- [x] loader-highpriority
- [x] loader-maven
- [x] loader-mercurial
- [x] loader-npm
- [x] loader-nixguix
- [x] loader-opam
- [x] loader-pypi
- [x] remaining staging listers