fix: Remove reference to automated docs builds in readme (#13)

Author: charmasaur

README.md

@@ -99,7 +99,7 @@ For general guidelines, see [Contributing](https://github.com/qctrl/.github/blob
 
 ### Building documentation
 
-Documentation generation relies on [Sphinx](http://www.sphinx-doc.org). Automated builds are done by [Read The Docs](https://readthedocs.com).
+Documentation generation relies on [Sphinx](http://www.sphinx-doc.org).
 
 To build locally: