Merge branch 'mechanics' into 'main'

docs/conf.py

docs/examples/howto_meshplotlib/plot_aspect_ratios.py

docs/examples/howto_meshplotlib/plot_meshplotlib_2d.py

docs/examples/howto_meshplotlib/plot_solid_mechanics.py

docs/examples/howto_propertylib/plot_propertylib.py

...les/howto_studies/plot_convergence_study_nuclear_decay.py

ogstools/_examples/mechanics_example.vtu

ogstools/meshplotlib/TODO

ogstools/meshplotlib/core.py

ogstools/meshplotlib/examples/__init__.py

ogstools/meshplotlib/levels.py

ogstools/meshplotlib/plot_features.py

ogstools/meshplotlib/plot_setup.py

ogstools/meshplotlib/plot_setup_defaults.py

ogstools/propertylib/__init__.py

ogstools/propertylib/custom_colormaps.py

ogstools/propertylib/matrix.py

ogstools/propertylib/mesh_dependent.py

ogstools/propertylib/presets.py

ogstools/propertylib/property.py