Workflow updates for 0.2 Version

[dario-coscia]

By now the 0.2 version contains multiple workflows which needs to be updated:

1. monthly tag: inside the code reference utils/mathlab_versioning.py which imports meta.py (removed in 0.2 #401 ).
2. pypi publish: inside we build the weel using python 3.7 which is the only one not supported by the package.
3. black formatted: I think this workflow can be safely remove as long as PR not passing black-formatter-test.ym are not merged.
4. converge deploy: by now coverage deploy is only tested for python 3.8, maybe we can try to structure it also for the other versions.
5. joss: do we still need this?

Also, maybe we can unify PyPI publish and doc deploy as a unique workflow called deploy_after_tag which is triggered for deploying the doc and the PyPI.