Improve first render inline CSS

This change removes front.css and article.css and puts their contents in one of two places. Either the (inline) head.css for things needed on initial render, or global.css which is loaded after initial render. This adds about 4kb to the inline CSS, but fixes the render flash on fronts and articles.

It also removes the CSS lazy load switch as we've never used it, and we like our lazy loaded CSS now.