Bibliothecary alternative in python

[cornerman]

To drop ruby dependency.

[Ly0n]

We could use the Github API to gather all dependency information:

https://docs.github.com/en/github/visualizing-repository-data-with-graphs/about-the-dependency-graph

Pro:

• Pure Python enables PIP package creation
• Simpler project structure
• Less accounts needed / Less API needed since Libraries.io is not needed

Contra:

• Much more difficult to use OpenSelery with other Git platforms like Gitlab