[mermaid](http://knsv.github.io/mermaid/) is an open source tool for generating diagram and flowchart from text in a similar manner as markdown. This docker image contains mermaid 7.0.11 and is build on top of the official node 8.8.1 image. Installing the dependency phantomjs is tricky. I chose the solution from [jribar](https://hub.docker.com/r/jribar/node-phantomjs/~/dockerfile/).