message: fix octicon import
diff: import * as primerComponents from '@primer/components'
  import * as doctocatComponents from '@primer/gatsby-theme-doctocat'
  +import Octicon, {iconsByName} from '@primer/octicons-react'
  -export default {...primerComponents, ...doctocatComponents}
  +const iconComponents = Object.keys(iconsByName).reduce((map, key) => {
  + map[iconsByName[key].name] = iconsByName[key]
  + return map
  +}, {})
  +
  +export default {...primerComponents, ...doctocatComponents, ...iconComponents}
  