The Docker instructions here don't work. When I try to access /instructions or any of the specific pages of generated instructions such as /lets-encrypt/snap-other I get a 404.

Another problem we have now is the Dockerfile is still based on the old node:8 image which is based on Debian 9. The newest version of Python Debian 9 has is Python 3.5 so we need to update to a newer image to be able to build our docs.