Node.js Grid and Spacing Spec

[amiller-gh]

In preparation for an open call for designers to contribute, we need to lock down some foundational design elements to help keep a degree of Node.js brand consistency between high fidelity mocks.

Delivering a comprehensive grid and item spacing spec will be an import part of this Node.js Design System.

[codeekage]

we could also use a wr-agenda on this

[maddhruv]

I am working on a responsive grid layout in css with flexbox. Will complete it by the end of this month.

If we can use that on the website too.

[Trott]

I've unarchived this repo so I can close all PRs and issues before re-archiving.