Reduced p lineheight
Author Plugin now exposes `author` object onto files.

Removing the `author` and `username` field of guides in favor of the
`guide.author` object.
Added 404 page.
Added nginx guide
Fixed image links
Added the highlighted nano image
Added Editing your Profile Guide
Added profile edit guide to sidebar
Merge branch 'code-reducelineheight'
Merge branch 'guide-editingprofile'
Merge branch 'code-404'
Merge branch 'guide-nginx'
Merge branch 'code-userlinks'