Adg

📖 Major documentation overhaul:
- Fix dependencies for instance attributes documentation
- Fix several attributes documentation missing
- Move to Read The Docs v2 configuration file
- Update the documentation to include a deprecation warning for Python versions <3.7
- Update the README accordingly and fix its formatting

- Fix deprecated NetworkX calls -- Thanks cheshyre for reporting it!
- Fix broken logic for vertex exchange factor exposed by fixes in NetworkX2.7+
- Add a missing test case for vertex exchange factor in (P)BMBPT to cover previous remaining silent
- Extend coverage to Python3.11
- Move CD/CI tests to GitHub Actions
- Minor documentation updates

- Add the citing info for the BIMSRG EPJA paper
- Extend CI coverage to Python 3.10
- Various documentation adjustments

- Fix qp labels in BIMSRG diagrams expressions
- Add [BIMSRG pre-print](https://arxiv.org/abs/2102.10889) to README and doc
- Make sure permutation operators are properly displayed
- Avoid program crashes for BIMSRG with 7-body operators and higher
- Fix broken tests
- Use updated affiliation for TUDa
- Update BIMSRG example output

- Add Bogoliubov In-Medium Similarity Renormalization Group formalism
- Add the reference for the [PBMBPT paper](https://doi.org/10.1016/j.cpc.2020.107677)
- Update the documentation
- Automatise the PyPI deployment
- Ensure compatibility with Python3.9
- Remove deprecated calls to NumPy and NetworkX
- Various improvements to the codebase
- Extended the test suite

* Add the Projected Bogoliubov Many-Body Perturbation Theory Formalism.
* Port the code to Python 3.
* Remove deprecated calls to [NetworkX](https://github.com/networkx/networkx).
* Reduce the memory requirements of diagrams.
* Optimise the BMBPT diagram generation process.
* Fix several errors in the documentation.
* Fix the installation process for optional dependencies.