add the new docs url

Author: zingale

README.md

@@ -3,7 +3,7 @@
 [![flake8](https://github.com/python-hydro/pyro2/actions/workflows/flake8.yml/badge.svg)](https://github.com/python-hydro/pyro2/actions/workflows/flake8.yml)
 [![pytest-all](https://github.com/python-hydro/pyro2/actions/workflows/pytest.yml/badge.svg)](https://github.com/python-hydro/pyro2/actions/workflows/pytest.yml)
 
-[![Documentation Status](https://readthedocs.org/projects/pyro2/badge/?version=latest)](https://pyro2.readthedocs.io/en/latest/?badge=latest)
+[![github pages](https://github.com/python-hydro/pyro2/actions/workflows/gh-pages.yml/badge.svg)](https://github.com/python-hydro/pyro2/actions/workflows/gh-pages.yml)
 
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/python-hydro/pyro2/main?filepath=examples%2Fexamples.ipynb)