Merge branch 're-merge-handbook' into 'master'

.gitlab-ci.yml

docs/_static/2fa.png

docs/admin/00_index.rst

docs/admin/01_core_concepts.rst

docs/admin/02_config.rst

docs/admin/02_install.rst

docs/admin/03_ldap.rst

docs/admin/04_monitoring.rst

docs/admin/04_socialaccounts.rst

docs/admin/05_monitoring.rst

docs/admin/06_configuration_options.rst

docs/admin/06_storage.rst

docs/appendix/00_index.rst

docs/appendix/99_eupl.rst

docs/conf.py

docs/dev/00_index.rst

docs/dev/01_setup.rst

docs/dev/03_run_tests.rst

docs/dev/04_materialize_templates.rst

docs/dev/06_merging_app_settings.rst