Swaps out h4s for h3s

For a clearer outline.
Updates h2, h3 and h4 styling
Adds link to design history
Set min.css link back
Merge branch 'development'

* development:
  Set min.css link back
  Adds link to design history
  Updates h2, h3 and h4 styling
  Swaps out h4s for h3s
Fixes meta viewport syntax