ReactUSWDS Version & USWDS Version:

USWDS 2.11.2 at the time of writing

Describe the problem

hero.png is massive. Larger than all the other code and styles combined. We should not export it, in my opinion.

To Reproduce
Steps to reproduce the behavior:

1. run yarn or yarn build.
2. The build output will show the warning about the large png file. It is hero.png from USWDS

Expected behavior

The images are example images. Most consumers will use their own image. Reduce the bundle size by excluding them. Consider the release breaking in the event that some consumers may be using them.