remove meta links until they have a visual treatment
type hierarchy improvements
increase interp padding and margins
site title adjustments
add external link icons
paragraph line spacing and dividers
reset margins and paddings in interp view to avoid jump on display
highlight TOC link on open
retinafy the external link icon
Overflow and height property to fixed container fixes #83
Merge remote-tracking branch 'upstream/master'
Merge pull request #87 from ascott1/master

Design updates