message: Fix site exportPathMap
diff: @@ -15,8 +15,9 @@ module.exports = withPlugins({
  webpack: (config, options) => {
  return config
  },
  - exportPathMap: () => {
  + exportPathMap: defaultPathMap => {
  return {
  + ...defaultPathMap,
  '/': { page: '/about' },
  }
  },
  