Move away from installation script

[paulfantom]

Using external installation script is convenient but provides zero control over it. Also I don't think it is right way to use ansible.

Script could be rewritten to ansible tasks to provide more control over role as well as clearer output what this role does at the moment.
Here is one role from which tasks could be copy-pasted: https://github.com/SoInteractive/ansible-docker for better installation method.