glad that information reached and appears to be useful to you.
As far as I know there is a hand-made email list going slowly, with a few tens of people involved. I have offered them @gandhiano and my support to go more public with communication, in case they wish so.
Thank you for trying out and following that route. Hypothesis, as the website explains which you can see after following its link, is a tool for so-called annotation of texts, primarily web sites. Yet since the web is great, and we can also watch PDF files in web browsers, we can annotate PDFs, too! This is a useful tool for discussing documents and building a knowledge commons around reading groups.
The original PDFs (without annotations) can be downloaded from: