updated start page layout and content
more minor cleanups for start page layout
Merge pull request #165 from ministryofjustice/front-end/start

Front end/start
fixed merge conflict
skip sign out page when previously entered email address
Merge pull request #185 from ministryofjustice/front-end/password

Front end/password
Merge pull request #187 from ministryofjustice/skip_signout_page

skip sign out page when previously entered email address
cleaned up claim details page a bit