* Put NGINX, Celery, and RabbitMQ into their own separate containers
* Use a docker network instead of the deprecated --link
* Allow for collecting the static files properly
* Create a copy of settings.py specifically for the docker setup. This
will need to be kept in sync with the main example settings.py, but
it avoids the user having to edit it too much.
* Add optional SSL configuration using letsencrypt certificate
* Create some volumes for static files / fetched repos
* Add some more helpful setup instructions
Largely based upon work by Michael Halstead <michael@yoctoproject.org>.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>