Fix up styling after HTML refactor
Fix up styling after HTML refactor

- Style control links so they tuck in on the left for mobile and don't mess with the (optional) list title on wide+tablet screen widths
- Styling for sections as a list of links rather than a stack of sections
- Move arrows onto a negative margin
- Override default list and link styles

alphagov/manuals-frontend,alphagov/manuals-frontend,alphagov/manuals-frontend,alphagov/manuals-frontend