📚 DOCS: Link to jupyter book

Author: chrisjsewell

README.md

@@ -6,6 +6,7 @@
 [![PyPI][pypi-badge]][pypi-link]
 
 A sphinx extension that allows the documentation site-map (a.k.a Table of Contents) to be defined external to the documentation files.
+As used by [Jupyter Book](https://jupyterbook.org)!
 
 In normal Sphinx documentation, the documentation site-map is defined *via* a bottom-up approach - adding [`toctree` directives](https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#table-of-contents) within pages of the documentation.
 

docs/intro.md

@@ -1,6 +1,7 @@
 # sphinx-external-toc
 
 A sphinx extension that allows the documentation site-map (a.k.a Table of Contents) to be defined external to the documentation files.
+As used by [Jupyter Book](https://jupyterbook.org)!
 
 In normal Sphinx documentation, the documentation site-map is defined *via* a bottom-up approach - adding [`toctree` directives](https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#table-of-contents) within pages of the documentation.