Update requirements to use GitHub for sphinx-thebe (#34)

Replaced sphinx-thebe package with GitHub URL.

Author: Tom-van-Woudenberg

requirements.txt

@@ -5,7 +5,6 @@ sphinx-image-inverter
 download_link_replacer
 
 # now list the packages (and the respective url) you wish to download from the GitLab package registry
---extra-index-url https://gitlab.tudelft.nl/api/v4/projects/11239/packages/pypi/simple
-sphinx-thebe ~= 0.9.9
+git+https://github.com/TeachBooks/Sphinx-Thebe
 plotly
 nbformat