preview

first thanks for this amazing plugin
I created new package that work as a plugin for device_preview ,
screenshot_modes
easy automatice way for take screenshot for your app
if you could mentions it in device_preview docs in plugin sections as a thirdparty plugin , will be great

As discussed here microlinkhq/sdk#80 (review)

https://www.styled-components.com/docs/advanced#theming

A scenario that came up in our community slack:

User requests gatsby image data from GraphQL, but due to a misunderstanding passes this data to the getGatsbyImageData() method. It crashes because of an invalid expectation on what the input looks like.

It looks like we:
a) Need more input validation on the getGatsbyImageData() method
b) Could detect if already in the right format and th