Merge branch 'extract-live-settings' into add-licence

.gitlab-ci.yml

doc/_static/merge-request-pipelines-all-cut-dev.png

doc/_static/merge-request-pipelines-all-cut.png

doc/_static/merge-request-pipelines-all.png

doc/_static/merge-request-pipelines-delete-dev.png

doc/_static/merge-request-pipelines-delete.png

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doc/configure_instance.rst

doc/jm_documentation.rst

doc/life_cycle.rst

doc/life_cycle_demo.rst

doc/mass_mailing.rst

doc/security_feature.rst

src/strass/live_settings/__init__.py

src/strass/live_settings/admin.py

src/strass/live_settings/context_processors.py

src/strass/live_settings/forms.py

src/strass/live_settings/migrations/0001_initial.py

...settings/migrations/0002_create_group_settings_changer.py

...trass/live_settings/migrations/0003_auto_20200311_1037.py