feat: provide user feedback when db name doesn't exist

[bashbunni]

I was digging through the source for our deletion PR and I noticed that when using the nameFromArgs function, it will reset the default skate DB if the argument provided is invalid without notifying the user that their input was incorrect. I think we should notify the user + provide some suggestions on what DB they may have meant. I have a branch doing this already that I'll get reviewed alongside the deletion PR