updates to the simple salt dome

docs/examples/Simple_Salt_Dome.md

docs/examples/index.md

docs/examples/simple_salt_dome_final_model_3D_view.png

...les/simple_salt_dome_final_model_3D_view_with_lattice.png

.../examples/simple_salt_dome_final_model_misfit_2D_view.png

docs/examples/simple_salt_dome_final_model_residual.png

docs/examples/simple_salt_dome_inversion_settings.png

docs/examples/simple_salt_dome_optimal_lattice_3D_view.png

docs/examples/simple_salt_dome_population_quality.png

...amples/simple_salt_dome_starting_model_misfit_2D_view.png