work-in-process, collaborative editing space for PDF making using pads (<> Ethertoff http://osp.kitchen/tools/ethertoff/ <> Etherbox https://networksofonesown.constantvzw.org/ <> JupyterPi https://git.xpub.nl/XPUB/jupyterpi)
* configure the webserver to listen to the port of the flask application, for example with a subdomain (`cp /etc/nginx/sites-enabled/previousexample.vvvvvvaria.org.conf /etc/nginx/sites-enabled/new.vvvvvvaria.org.conf`)
* expand the current https certificate for this subdomain, using Letsencrypt
* restart nginx (`sudo service reload nginx`)
* keep the flask application running in the background: add the new instance of pad2pdf to supervisor (`cp /etc/supervisor/conf.d/previousexample.conf new.conf`)
* restart supervisor (`sudo service reload supervisor`)