Install with:

    cp systemd/conservancy-www-*.{service,timer} /etc/systemd/system

    systemctl enable conservancy-www-cleanup.service

    systemctl start conservancy-www-cleanup.service

    systemctl enable conservancy-www-update.timer

    systemctl start conservancy-www-update.timer

Monitor with:

    systemctl list-timers --all

    journalctl --catalog --follow --unit conservancy-www-update.service

Updates will fail unless `/var/www/website` has a git upstream, so set that with:

    git remote add upstream https://k.sfconservancy.org/website

    git branch --set-upstream-to=upstream/master master