article menu focus tab order bugfix

[StephDriver]

• items not showing were corrected in #4178 so this branches off that.
• With all items now present, but in wrong order two further changes required:
  • remove 'align-right' which was reversing the visual order of the menu items.
  • adjust column widths within the Foundation Flex layout so that the menu itself remained 'right aligned' (while contents was not reordered). Small is covered by the hamburger menu, so this required settings for medium and large.

Closes #3933