Factor notification system out into library

changed due date to February 07, 2020

added workflow::discussing label

added workflow::confirmed label and removed 1 deleted label

removed due date

assigned to @nik

removed milestone

unassigned @nik

We are currently looking into django-notifs: https://github.com/danidee10/django-notifs

changed title from Refactor notification system out into library to Factor notification system out into library