Doc refactor

.gitignore

docs/source/index.rst

docs/source/library/ale/index.rst

docs/source/library/capi/capi.rst

docs/source/library/capi/index.rst

docs/source/library/index.rst

docs/source/library/python/base.rst

docs/source/library/python/cassini_driver.rst

docs/source/library/python/index.rst

docs/source/library/python/lro_driver.rst

docs/source/library/python/mdis_driver.rst

docs/source/library/python/mro_driver.rst

docs/source/library/python/util.rst