loongson/pypi: links for sphinx-preview

loongson/mirror sphinx_preview-0.1.2.tar.gz
loongson/mirror sphinx_preview-0.1.2-py3-none-any.whl
loongson/mirror sphinx_preview-0.1.1-py3-none-any.whl
loongson/mirror sphinx-preview-0.1.0.tar.gz