Update copy for page to match prototype
Update copy for MHRA email alerts

Make the copy for this page match the prototype.
Update view and stylesheets to match prototype

MHRA email alerts needs to look like the prototype. Re-arrange the HTML, remove a lot of unused divs, slimline the CSS and update how the page looks.
Fix failing tests for new email signup copy
Merge pull request #1853 from alphagov/make-interstitial-like-prototype

Make interstitial like prototype