Support PDF generation via a headless Chromium running in the background using celery

added part::backend part::frontend prio::1 type::feature labels

created merge request !464 (merged) to address this issue

mentioned in merge request !464 (merged)

mentioned in merge request AlekSIS-App-Chronos!77 (merged)

changed title from Support PDF generation via electron-pdf running in the background using celery to Support PDF generation via an headless Chromium running in the background using celery

changed title from Support PDF generation via an headless Chromium running in the background using celery to Support PDF generation via a headless Chromium running in the background using celery

mentioned in merge request AlekSIS-App-Alsijil!179 (merged)

closed with merge request !464 (merged)

mentioned in commit 183a0dbf