root/pypi: links for cal-docs-server

root/pypi cal_docs_server-3.0.0b4-py3-none-any.whl
root/pypi cal_docs_server-3.0.0b3-py3-none-any.whl
root/pypi cal_docs_server-3.0.0b2-py3-none-any.whl
root/pypi cal_docs_server-3.0.0b1-py3-none-any.whl