message: use getAssetPath in IndexImage
diff: import React from 'react'
  +import {getAssetPath} from './_utils'
  -const IndexImage = () => {
  - let assetPrefix = ''
  - const nowData = global.__NOW_DATA__
  - if (nowData) {
  - assetPrefix = nowData.assetPrefix
  +export default function IndexImage() {
  + return <img alt="" src={getAssetPath('primer-components.svg')} />
  }
  - const asset = path => assetPrefix + path
  - return <img alt="" src={asset('/static/assets/primer-components.svg')} />
  -}
  -
  -export default IndexImage
  