Considering it is a submodule, one way for you to see its content is to:
- clone that gitHub repo locally
-
do a:
git submodule update --init
But you should be able to click on it and browse its content directly from the web, if it was a repo hosted by GitHub.
See an example in my project https://github.com/VonC/compileEverything, where the submodule SemanticUI is directly browsable.