Style and place search bar in docs

* Style documentation nav links
* Move search bar to partial
* Reduce spacing in doc nav items
* Refactor start a new site doc
* Add helper for active link - need dev to refactor
Polish landing page links, hero, and hover effect

* Update copy in introduction
* Improve color of hover links
* Add color and animation to global nav hover
Use waypoints to animate global nav

* Resolve merge style conflicts