Merge branch 'master' into 331-user-registration

.gitlab-ci.yml

Dockerfile

README.rst

aleksis/core/apps.py

aleksis/core/data_checks.py

aleksis/core/forms.py

aleksis/core/migrations/0010_external_link_widget.py

aleksis/core/mixins.py

aleksis/core/models.py

aleksis/core/preferences.py

aleksis/core/rules.py

aleksis/core/settings.py

aleksis/core/static/js/multi_select.js

aleksis/core/templates/core/base.html

aleksis/core/templates/core/base_print.html

...templates/core/dashboard_widget/external_link_widget.html

aleksis/core/templates/core/index.html

aleksis/core/templates/core/notifications.html

aleksis/core/templates/templated_email/notification.email

aleksis/core/urls.py