OCR engine and language data attribution

This deployment includes tesseract-wasm 0.11.0, whose BSD 2-Clause license is
included in tesseract-wasm-LICENSE.md. Its WebAssembly binary contains
Tesseract OCR 5.3.0 (Apache License 2.0) and Leptonica 1.83.1 (BSD 2-Clause).
The Apache License 2.0 text is included in tesseract-ocr-Apache-2.0.txt.

The language files eng.traineddata, deu.traineddata, fra.traineddata, and
spa.traineddata are vendored from tesseract-ocr/tessdata_fast under the Apache
License 2.0:
https://github.com/tesseract-ocr/tessdata_fast

The exact source packages and versions are recorded here so the files can be
matched to the lazy OCR assets emitted by the build:
- tesseract-wasm 0.11.0: https://github.com/robertknight/tesseract-wasm
- Tesseract OCR: https://github.com/tesseract-ocr/tesseract
- Leptonica: https://github.com/DanBloomberg/leptonica