barlow 4.7.x-1.1

The CSS has been reorganized: typography and layout styles reside in their own files, while color, borders, images and other "branding" elements are still in style.css.

Now it's much easier to customize and build upon Barlow without touching the original files:

1. create a subdirectory of the theme
2. copy the style.css file inside it
3. change the first two lines, which includes the layout and typography styles, to point to the parent directory by prepending "../" to the path
4. tweak the rest of the stylesheet as much as you like