add Greater Anglia cs to basic page
Update index.html
tidied up spacing around title and video, corrected hover state of video tagline
Merge pull request #297 from gocardless/customer-stories-banner-on-basic

adds Greater Anglia customer story to basic page
cleans up code, nests customer story within overview scroll-target div
moves more-videos cta to within vimeo player, to be shown at end of video
points to video with new thumbnail
Fixing merge conflict