Package theme kit for APT, so that installation via apt-get are possible

[larsschellhas]

Is your feature request related to a problem? Please describe. When I run a CI pipeline in a docker environment I can install linux/ubuntu packages via apt-get. Packages which are installed this way can be cached by the CI-system, enabling quicker builds.

Compared to the installation via the python script, this would create great benefits for CI-setups.

Describe the solution you'd like Publish theme kit to Debian or Ubuntu, following these guides: https://askubuntu.com/questions/16446/how-to-get-my-software-into-ubuntu