Merge the Transkribus and file imports

.gitlab-ci.yml

.isort.cfg

Dockerfile

Dockerfile.binary

arkindex/documents/fixtures/data.json

arkindex/documents/models.py

arkindex/process/api.py

arkindex/process/builder.py

arkindex/process/managers.py

arkindex/process/migrations/0018_remove_transkribus.py

arkindex/process/models.py

arkindex/process/serializers/imports.py

arkindex/process/tests/test_processes.py

arkindex/process/tests/test_transkribus_import.py

arkindex/project/api_v1.py

arkindex/project/checks.py

arkindex/project/config.py

arkindex/project/default_corpus.py

arkindex/project/mixins.py

arkindex/project/settings.py