Merge ponos cleaned up source code

.gitlab-ci.yml

.isort.cfg

Dockerfile

Dockerfile.binary

Makefile

README.md

arkindex/documents/management/commands/bootstrap.py

arkindex/documents/management/commands/build_fixtures.py

arkindex/documents/management/commands/cleanup.py

arkindex/documents/tests/commands/test_cleanup.py

arkindex/documents/tests/tasks/test_export.py

arkindex/ponos/__init__.py

arkindex/ponos/admin.py

arkindex/ponos/api.py

arkindex/ponos/apps.py

arkindex/ponos/authentication.py

arkindex/ponos/aws.py

arkindex/ponos/fields.py

arkindex/ponos/forms.py

arkindex/ponos/helpers.py