Merge branch 'planetary_docs' into 'master'

.gitignore

doc/RTD/source/EquationOfState/index.rst

doc/RTD/source/HydroSchemes/index.rst

doc/RTD/source/HydroSchemes/planetary.rst

doc/RTD/source/conf.py

doc/RTD/source/index.rst

examples/EoSTables/get_eos_tables.sh

examples/GiantImpactUranus/README.md

examples/GiantImpactUranus/configuration.yml

examples/GiantImpactUranus/get_init_cond.sh

examples/GiantImpactUranus/output_list.txt

examples/GiantImpactUranus/plot_solution.py

examples/GiantImpactUranus/run.sh

examples/GiantImpactUranus/system.yml

examples/GiantImpactUranus/uranus_1e6.yml

examples/parameter_example.yml