first draft of post-start page and 'make a one-off payment' with content reviewed by GDS content editor who will also write the start page. Changed 'payment' to 'price-per-crossing'.
Links fixed
Merge remote-tracking branch 'origin/feature'
copy tweaks to make a one-off payment, checked links for check for a paid crossing and changed copy, checked links from choose.html
Merge remote-tracking branch 'origin/hot-fix-account-management'
copy changes from Katya and fixed more broken links
Merge branch 'feature' of https://github.com/AmyWhitney/dart-charge-HA into feature