match primer-css readme intro

Author: broccolini

packages/primer-css/README.md

@@ -3,7 +3,7 @@
 [![NPM version](http://img.shields.io/npm/v/primer-css.svg)](https://www.npmjs.org/package/primer-css)
 [![Build Status](https://travis-ci.org/primer/primer-css.svg?branch=master)](https://travis-ci.org/primer/primer-css)
 
-> Primer is the CSS toolkit that powers GitHub's front-end design. It's purposefully limited to common components to provide our developers with the most flexibility, and to keep GitHub uniquely *GitHubby*. It's built with SCSS and available via NPM, so it's easy to include all or part of it within your own project.
+> Primer is the CSS framework that powers GitHub's front-end design. Primer-css includes 23 packages that are grouped into 3 core meta-packages for easy install. Each package and meta-package is independently versioned and distributed via NPM, so it's easy to include all or part of Primer within your own project.
 
 This repository is a compilation of [several CSS modules](https://github.com/primer).