Create parameters description in the documentation

[nico-canta]

• Switch to Python 3.11
• Compile petsc4py manually with the correct Cython
• Mock petsc4py on ReadTheDocs to accelerate documentation building (takes a few minutes less)

[nico-canta]

Hi @cattabiani, now in the documentation, there are links to VasculatureParams. For example here https://astrovascpy--33.org.readthedocs.build/33/generated/astrovascpy.bloodflow.html#astrovascpy.bloodflow.update_static_flow_pressure

The docstring of this class describes all the parameters used in the model. Does it work well for you?