no issue

- backgroundImagePreview only had one purpose, which was to toggle
  a condition in the UI whether it will output the background preview or
not. We can achieve the same by checking whether the type (maybe should
should rather be renamed to style in future) is 'image' as opposed to
'dark, light, accent'.
- it's also more Storybook friendly which backgroundImagePreview wasn't
  because it had props passing from the Node, which Storybook doesn't
have access to.