Release messages will only show if a user has not already opted into the responsive site.
Realistically, we will still be releasing after the old date
Merge branch 'master' of github.com:guardian/frontend into preferences
Keep the "footer" message for users who are opted in.
Merge branch 'master' of github.com:guardian/frontend into preferences
moving file to right place
Merge pull request #5680 from guardian/preferences

Do not show release messages to users already using the responsive site