Enable PDF documentation download for accessibility

[patrickwalton]

I have a sleep disorder that makes it very difficult to do long reading unless I put it on an e-reader and walk outside. Could you please enable pdf export of the Hatch documentation for users like me? It looks like there may be a plugin for this: https://timvink.github.io/mkdocs-print-site-plugin/how-to/export-PDF.html

[ofek]

Sure, sounds reasonable!