Drop a PDF onto a web page and have it converted into JPEG images (using PDF.js) and then OCRd (using tesseract.js).

Combination of https://github.com/simonw/til/blob/main/templates/pages/tools/annotated-presentations.html and https://github.com/datasette/datasette-extract/blob/main/datasette_extract/templates/_extract_drop_handler.html