set base font size to 18px
site name should be centered in box
rough initial style for MP speech search box
right align party and constituency cell
use em-calc rather than emCalc which is obsolete
correct font weight for tab navigation
Initial styles for top navigation

WIP so some placeholder things there and assembly navigation not working
correctly yet.
wrap member name in div

don't apply grid directly to the h1 we use for the name as it upsets
margins and makes styling things tricky
also remove margins from h1 as we're using the grid margins
tweak constituency placeholder text order
remove redundant css