ECOM-811 design and layout changes

@wedaly @stephensanchez @rlucioni here are the style and text updates. Unfortunately I had to use teh dreaded !important in my Sass to override some ridiculously specific selectors, but after the A/B test we can clean this up by removing the legacy styles.
It looks like you switched the copy for the face photo and ID photo steps! This copy describes how to take a face photo, but it's in the template for the ID photo step.