Merge branch 'master' into '75-migrate-to-django-3-0'

.gitlab-ci.yml

CONTRIBUTING.rst

Dockerfile

apps/official/BiscuIT-App-Alsijil

apps/official/BiscuIT-App-Chronos

apps/official/BiscuIT-App-Exlibris

biscuit/core/menus.py

biscuit/core/migrations/0006_create_superuser.py

biscuit/core/migrations/0007_unlink_school_schoolterm.py

biscuit/core/models.py

biscuit/core/settings.py

biscuit/core/templates/contact_form/contact_form.html

biscuit/core/templates/contact_form/contact_form.txt

biscuit/core/templates/contact_form/contact_form_sent.html

biscuit/core/templates/contact_form/contact_form_subject.txt

biscuit/core/tests/browser/test_selenium.py

biscuit/core/urls.py

biscuit/core/util/core_helpers.py

docker-compose.yml

docker/entrypoint.sh