The source of https://spatialtoolbox.vuforia.com/
Clone this repo then run git submodule update --init --recursive in it to
download the documentation submodule.
Now run bundle install followed by bundle exec jekyll serve to start the
server locally. Note that it may be a good idea to update the server host in
_config.yml to be http://localhost:4000 so that links keep you on the local
server.