Fix page categorisation
Add new guidance on header and footer
Add new header images, remove old ones
Fix typo
Add links to index page
Fix audience and phase meta data
Update what-should-service-look-like.md
Update third header pattern image
Merge branch 'header-footer' of github.com:alphagov/government-service-design-manual into header-footer
Change breadcrumbs to user-centered-design
Merge pull request #191 from alphagov/header-footer

Header & footer guidance