Add new overrides for PLOS's "full menu" content
Add PLOS's footer-secondary-menu content
Move ftl/common files into new subdirectories (matching parent theme)
Create 'code' and 'content' superdirectories for themes

Part of a prototype for modeling static content as part of a theme.
Change '**/content/**/text/' to '**/content/**/page/'
Fill in privacy policy text (as example static text)
Add journal-branded navigation elements