Implement extraction command

.gitlab-ci.yml

MANIFEST.in

README.md

dan/__init__.py

dan/cli.py

dan/datasets/__init__.py

dan/datasets/extract/__init__.py

dan/datasets/extract/arkindex_utils.py

dan/datasets/extract/extract_from_arkindex.py

dan/datasets/extract/utils.py

dan/datasets/utils.py

dan/ocr/__init__.py

dan/ocr/document/__init__.py

dan/ocr/document/train.py

dan/ocr/line/__init__.py

dan/ocr/line/generate_synthetic.py

dan/ocr/line/train.py

dan/ocr/train.py

requirements.txt

tests/conftest.py