Document project colors in JSON

[Wolfr]

I want to propose a change to make Bedrock easier for newcomers.

• Document project colors in JSON
• Render them out to SCSS using a gulp task (the filename would remain in Bedrock config, but it will now become the path where the file would be rendered to)
• The rendering would be based on a template

This is good because

• It allows you to document regardless of current SCSS structure, so a designer could help on this without writing SCSS
• It removes 1 thing from the default SCSS, my goal is to not have default SCSS at all
• It can make the SCSS file conform to the project's commenting style, currently we are basing ourselves on a certain commenting style that might be different in other projects
• BONUS It makes the colors accessible from Javascript, so one could for instance reference things back to a design app like Sketch using a library like https://github.com/airbnb/react-sketchapp

[Wolfr]

Design tokens avant la lettre. The diff here is definitely interesting.

https://github.com/usebedrock/bedrock/pull/206/commits/c8845aa2fe2db6f816c3f52de1cf12618855bfaa