Hi, DebOps author here.
The roles are available on Ansible Galaxy, but this not enough for our (project users) needs. There are also playbooks which cannot be distributed through the Ansible Galaxy. To make use of the whole project easier, a few scripts were written (available on PyPI).
If you want to check the project out, you can read the Getting Started guide which should let you set up a basic host with DokuWiki as an example application. The project is designed to be easy to use as a base for your own infrastructure - you can add your own Ansible roles and playbooks "on top" of DebOps so that you can use the project own roles like firewall and webserver management to manage your own services.
If you have any questions or find bugs, let me know, either here or on GitHub.