Currently only the main package was pinnned, which can lead to
unexpected behaviour if one of the dependencies of those packages
change.

This makes the coding-style consistent, and removes the "emotion"
from coding-style.

This makes it a bit easier to understand what belongs where, and
makes a bit easier to see what happens in main.py.

We are not paid per letter, so we can handle this :D

… other options

Flask comes with click built-in, so it needs a tiny bit of wrapping
to make useful.