Merge pull request #2 from hollymariegibbs/nav

Nav
newsletter sign up
Merge remote-tracking branch 'origin/newsletter'
about section
Merge pull request #3 from hollymariegibbs/about

about section
Updated primary sections with id anchors for nav.
Billboard tweaks.
Hover state for nav anchors.
JS magic for nav scrolly goodness.
Smooth CSS transition for active nag borders.