cretae empty dashboard
fix assign_person
Merge branch 'Axolotl' of https://github.com/hpi-swt2/event-und-raumplanung into Axolotl
fix showing user's identity_url instead of email in edit/show/index, delete get_email and associated test
add seeds for tasks, fix show task second attempt
Merge remote-tracking branch 'origin/Axolotl' into A/feature/#53
Add RSpec tests for task notifications
Add missing email notification when assignment is removed