* Use webrtc to capture photo, less clunky and allows scaling client-side
  for faster upload.
* Once quarantine expires, show how long it's been since expiry in case the
  user is feeling extra careful.
* Expire old images after some reasonable amount of time. This can be done
  with just a find command.
* Add systemd service file and Makefile to install it better.
* Improve CSS. (Patches welcome on this one.)
* The javascript could let things be added in offline mode, and sync up
  with the server next time it comes online. (Patches welcome on this one.)