Because I start the tray icon at i3's startup in my configuration file,
I do not need to add redshift-gtk as a requirement to systemd's default
target. This avoids having two redshift-gtk instances running.
I also removed the systemctl calls to enable the services from the
installation script. Maybe I'll switch back to using services instead of
launching the tray-icon at i3's startup someday.
The Redshift package on Arch doesn't seem to add a service file anywhere
so we have to add one ourselves in our configuration directory.
Geoclue doesn't seem to want to play nice with Redshift right now, so I
used the manual setting to add Paris' coordinates.
Bruno BELANYI