Changes order of notices and messages
Changes order of notices and messages

 - The notices didn't make sense - they were a heading level 2 at the
   top of the page, nested under the 'GOV.UK' heading level 1. They've
   been moved to sit under the page title.
 - To be consistent, the error message has also been moved underneath
   the title.

alphagov/frontend,alphagov/frontend,alphagov/frontend,alphagov/frontend