ability to specify output to _only_ dot or _only image

[ottobackwards]

Is your feature request related to a problem? Please describe.
right now, you always get both the image and the dot

Describe the solution you'd like
a way to specify that you only one one of them and which one

Describe alternatives you've considered
You could just ignore the file you don't want

Additional context
would have to add new cli parameter, and new yaml configuration handling, and update the publisher module