message: use Link components for <a> in MDX docs
diff: @@ -18,14 +18,21 @@ import * as docComponents from './doc-components'
  import '../src/primer-react.scss'
  const {SideNav, Header, customTheme} = docComponents
  -const {Box, FlexContainer} = primerComponents
  +const {Box, FlexContainer, Link} = primerComponents
  -const iconsObject = Object.keys(iconsByName).reduce((map, key) => {
  +const iconComponents = Object.keys(iconsByName).reduce((map, key) => {
  map[iconsByName[key].name] = iconsByName[key]
  return map
  }, {})
  -const components = {...primerComponents, ...docComponents, Octicon, ...iconsObject}
  +const components = {
  + ...primerComponents,
  + ...docComponents,
  + ...iconComponents,
  + Octicon,
  + // render links with our component
  + a: Link
  +}
  export default class MyApp extends App {
  static async getInitialProps({Component, ctx}) {
  