API endpoint to ingest transcriptions

arkindex/documents/api.py

arkindex/documents/managers.py

arkindex/documents/models.py

arkindex/documents/serializer_fields.py

arkindex/documents/serializers.py

arkindex/documents/tests/test_edit_elementpath.py

arkindex/documents/tests/test_text_create.py

arkindex/project/api_v1.py

arkindex/project/settings.py

arkindex/users/migrations/0002_create_tokens.py