Reorganization

README.md

dan/cli.py

dan/ocr/__init__.py

dan/ocr/decoder.py

dan/ocr/document/__init__.py

dan/ocr/encoder.py

dan/ocr/manager/__init__.py

dan/ocr/manager/dataset.py

dan/ocr/manager/metrics.py

dan/ocr/manager/ocr.py

dan/ocr/manager/training.py

dan/ocr/mlflow.py

dan/ocr/predict/__init__.py

dan/ocr/predict/attention.py

dan/ocr/predict/prediction.py

dan/ocr/schedulers.py

dan/ocr/train.py

dan/ocr/transforms.py

docs/ref/ocr/decoder.md

docs/ref/ocr/document/index.md