Fix documentation link

Author: liZe

pyproject.toml

@@ -34,7 +34,7 @@ doc = ['sphinx', 'sphinx_rtd_theme']
 test = ['pytest', 'pytest-cov', 'pytest-flake8', 'pytest-isort', 'coverage[toml]']
 
 [tool.flit.metadata.urls]
-Documentation = 'https://cssselect2.readthedocs.io/'
+Documentation = 'https://doc.courtbouillon.org/cssselect2/'
 Code = 'https://github.com/Kozea/cssselect2/'
 Issues = 'https://github.com/Kozea/cssselect2/issues'
 Donation = 'https://opencollective.com/courtbouillon'