sort out display on mobile

hide footer menu on mobile
add privacy link to main menu, hide on desktop
Internet Explorer tweaks for front page redesign

Make mySociety tab wider to fit logo
Just display text for FixMyStreet Platform link
remove border on front page .content to stop odd line under footer
split out footer marketing to own template

allows it to be overridden in cobrands without the need to provide a
whole new footer template