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.
"Edit Your Name", maybe?

I keep calling this out because some "title" elements you capitalize each word, but other "title" elements you don't.