Suggest put/update a link to the HuggingFace/jph00/testing

[tunglinwood]

Hello fastai team,

While I am following along the class I can not find a direct link to the testing repo on huggingface demonstrated in middle of the class, which is really helpful if a student wants to create a same demo on his/her own. So I would suggest to add/update a link in the course page. Thank you so much!

Tung-Lin Wu