The python package must be named radicale_storage_mongo

Review the package build and publication process.

Another issue is the layout of the projects and their interdependencies:

• alphabet/radicale_mongo> provides the radicale_mongo python package
• alphabet/radicale_laboite> contains a mongo.tar.gz with package radicale_storage_mongo containing radicale_mongo

  /usr/bin/docker run -it --rm -u 0:0 --workdir /tmp hub.eole.education/apps/radicale:latest /bin/sh
  /tmp # python3
  Python 3.8.10 (default, May  6 2021, 06:30:44) 
  [GCC 9.3.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> from radicale_storage_mongo import radicale_mongo
  >>>