Link to Calibre plug-in

[azazel-cat]

The link to the Calibre plug-in appears to be broken (I'd submit a PR to fix it but I can't find a working link to the plug-in).

[marcellmars]

i'm being sloppy here. should add the info about deprecating the plugin... the new tool in use is here: https://gitlab.com/marcellmars/accorder/

i might run the parallel server just for plugin and its tunnels.... that proved to be a good way to share few books with friends librarian would invite into session but it was too sloppy as something people should rely on...