They've been moved to https://github.com/UBC-DSCI/dsci-100-infra .
In the terminal, navigate to the directory where you would like to edit your files and run:
docker run --rm -it -p 8888:8888 -v ${PWD}:/home/jupyter ubcdsci/r-dsci-100-grading:2020W1
Then copy the last url from what is output on your terminal into a browser and you should be able to see and edit your files via Jupyter.