This will spawn a new Ubuntu VM, install Docker, and then await your
instructions. You can then SSH into the VM with `vagrant ssh`, become
`root` with `sudo -i`, and then you're right to go. Your live git repo is
-already available at `/var/discourse`, so you can just `cd /var/discourse`
+already available at `/vagrant`, so you can just `cd /vagrant`
and then start running `launcher`.