Add link to create-demo repo

Author: annegentle

_posts/articles/2019-04-20-github-pages-python-sphinx.md

@@ -86,6 +86,6 @@ Now you can run `make github` from the doc source directory to generate a local
 
 ## Pull it all together
 
-I've been working on a talk titled, "Make an Instant Web Site with Webhooks" for DevNet Create. In it, I show how to publish and host on GitHub Pages, which is built to use Jekyll by default, using Python Sphinx instead. I'll post the slides when it's done. In the meantime, we'd love to see you next week! Visit the [DevNet Create site](https://developer.cisco.com/devnetcreate/2019) for more information.
+I've been working on a talk titled, "Make an Instant Web Site with Webhooks" for DevNet Create. In it, I show how to publish and host on GitHub Pages, which is built to use Jekyll by default, using Python Sphinx instead. I've got a GitHub repository set up at [annegentle/create-demo](https://github.com/annegentle/create-demo) as a demonstration. I'll post the slides when it's done. In the meantime, we'd love to see you next week! Visit the [DevNet Create site](https://developer.cisco.com/devnetcreate/2019) for more information.
 
 {% include sign-up.html %}