message: re-add x0 config
diff: "build": "x0 build src/Index.js --out-dir docs",
  "test": "jest"
  },
  + "x0": {
  + "cssLibrary": "styled-components",
  + "basename": "/primer-react"
  + },
  "repository": {
  "type": "git",
  "url": "git+https://github.com/primer/primer-react.git"
  