- build.py: Added weasyprint fallback for PDF when xelatex unavailable
- build.py: Added --html flag for standalone pandoc HTML book output
- book-style.css: Added @media print rules for browser Print-to-PDF
- Makefile: Added 'html' target and weasyprint check to 'make check'
- website/index.html: Added HTML download link and Print to PDF option
- Regenerated testament-complete.md, testament.epub, testament.html
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