`HEALTHCHECK` instruction has been added to `Dockerfile`. This should
allow `docker-compose` installations to monitor and restart the
container if neccessary.
Kubernetes deployment healthcheck has been tweaked a bit to better
validate that the server is actually running.
This is the initial commit of the helm chart.
TO-DO:
* write usage documentation
* add job which will automatically add the chart to `gh-pages` on
creating a new release
