WEB: Removing links to pdf version of the docs from web and docs
Remove the links to the docs pdf in preparation to not generate it anymore in future releases.
> LGTM. Related, do you think we should keep the commands to generate the PDF (in `make.py` I believe)?

Good point. I'd leave it for now. We may still get feedback of users who do care about the pdf, or maybe people want to be able to build the pdf locally even if we don't publish them anymore. I'd leave it for now, as it's just one function in that make.py, so almost no maintenance or complexity cost. Thanks @datapythonista 