Because of limitations in pub.dev handling of image references, the links in the README are directly to the source; they didn't get updated when the package was moved. For now we should probably switch them to pinned versions instead of main to avoid this kind of problem in the future. (We'll need to switch back if we want to update the images later, but we can address that if/when it comes up; the fact that not only is this version of the README broken now, but many of the previous versions as well, is more problematic than the potential difficulty in updating them in the future.)