New navigation structure to make way for MU changes
Sexier blog description styling
Cleaning up old styles
Bigger padding on mobile header
Sticky footer
Revert "Sticky footer"

This reverts commit 3242e72cfcebe963d7fa132999e7745a93d82295.
First pass on major Casper overhaul and new Multi-user support

- Introduces author.hbs page template
- Completely refactors header styling with new full-screen cover images
- Adds new, improved pagination with additional styles for archive pages
- Cleans up a fuckload of bloat and old styles
merge in latest from try-ghost repo