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 new copy in this template describes how to take an ID photo, but it's in the template for the face photo step.