Reorganize docs with new structure

docs/source/auto/modules.rst

docs/source/auto/scriptconfig._ubelt_repr_extension.rst

docs/source/auto/scriptconfig.argparse_ext.rst

docs/source/auto/scriptconfig.cli.rst

docs/source/auto/scriptconfig.config.rst

docs/source/auto/scriptconfig.dataconfig.rst

docs/source/auto/scriptconfig.dict_like.rst

docs/source/auto/scriptconfig.file_like.rst

docs/source/auto/scriptconfig.modal.rst

docs/source/auto/scriptconfig.rst

docs/source/auto/scriptconfig.smartcast.rst

docs/source/auto/scriptconfig.util.rst

docs/source/auto/scriptconfig.util.util_class.rst

docs/source/auto/scriptconfig.util.util_exception.rst

docs/source/auto/scriptconfig.value.rst

docs/source/index.rst

docs/source/manual/getting_started.rst