Add siteSectionId to lookup result (#2533)

Author: taranvohra

packages/gitbook/src/middleware.ts

@@ -698,6 +698,7 @@ async function lookupSpaceByAPI(
  ...('site' in data
  ? {
  site: data.site,
+ siteSection: data.siteSection,
  siteSpace: data.siteSpace,
  organization: data.organization,
  shareKey: data.shareKey,