Optimise facia-cards for tablet and desktop

Mainly font sizing tweaks for tablet and desktop. Also includes adding standfirsts to specific items and making sure that bylines and titles are styled in the same way.
This is for tablet only where we use a 9 column grid, so 4.5 is half. I'd argue that `gs-span(4.5)` is actually being more explicit than `gs-span(4) + $gs-gutter * 2`.

However, to get this shipped, I've changed it for now.