Reformatting and making the images look nice.

src/Cxx/GeometricObjects/Planes.cxx

src/Cxx/GeometricObjects/PlatonicSolids.cxx

src/Cxx/GeometricObjects/PlatonicSolids.md

src/Python/GeometricObjects/Planes.py

src/Python/GeometricObjects/PlatonicSolids.md

src/Python/GeometricObjects/PlatonicSolids.py