Darkens the hero-image background-color on the homepage.

To aid in readability of the main message, this decreases the about of transparentization of the background-color for detailed hero images to a third.
Adds a tool for declaring a default background texture, mostly on boxes.

This adds the gradient-based background-default tool, intended to replace the PNG-based background texture on boxes and other elements.
Swaps out background-image PNG with gradient texture.

This uses the gradient-based background-default tool on boxes, in place of the old PNG image.
Swaps out background-image PNG with gradient texture.

This uses the gradient-based background-default tool on .secondary-nav, in place of the old PNG image.