Documentation links non-existent aw-watcher-window-hyprland

[jfietz]

The docs link this watcher, but the link itself is dead and the only mention of the aw-watcher-window-hyprland is in these docs:

https://docs.activitywatch.net/en/latest/watchers.html#window-watchers l

[ErikBjare]

The correct URL should be https://github.com/bobvanderlinden/aw-watcher-window-hyprland

Fixing now