Feature: Automatic dark mode triggering

[alirezadizaji]

Hi,

I implemented a feature to enable triggering dark mode automatically by developing a workflow. Beforehand, users should set a variable called trigger_darkmode, which by default is null meaning to disable this feature. If not null, then this variable should contain two keys: start_light and start_dark, indicating the hour to start light and dark mode respectively. Both should have the HH format.

[sproogen]

I think this is probably a bit of an overkill for triggering darkmode on a schedule. A simpler approach would be checking the status in the browser instead of a cron job to update the config and re deploy. But I think keeping a static option for dark mode is fine for now.