Add helpful error message when trying to use swww without daemon running

[Aiz0]

When running a command without first initializing the daemon you get this error message.
Error: "Failed to connect to socket: No such file or directory (os error 2)"
It's not immediately obvious what the problem is.

I think it would be helpful if a suggestion to check if the daemon is running was added (as a second line maybe?).
Something like this could work.
Is the swww daemon running?

[LGFae]

Apologies for the late reply, this week has been wild.

In any case, I was actually planning to improve this kind of error message just like this, but forgot about it. Thanks for reminding me!