Images embedded in blog posts break mobile responsiveness

[benslv]

Featured image at the the top of the post is fine, but any images inside the actual post body don't resize properly and stay a constant width even when the screen width decreases, which pushes content to the sides and off the screen

[HarryWickham]

Warning from build logs:
warning Specifying fullWidth images will ignore the width and height arguments, you may want a constrained image instead. Otherwise, use the breakpoints argument.
Might have something to do it