update references

lib/site-tree.js

@@ -1,5 +1,5 @@
 const path = require('path')
-const products = Object.values(require('./all-products'))
+const { productMap } = require('./all-products')
 const languageCodes = Object.keys(require('./languages'))
 const addTitlesToTree = require('./site-tree-titles')
 const allVersions = Object.keys(require('./all-versions'))
@@ -26,7 +26,7 @@ module.exports = async function buildSiteTree (pageMap, site, redirects) {
       siteTree[languageCode][version] = {}
       const productTree = {}
 
-      products.forEach(item => {
+      Object.values(productMap).forEach(item => {
         const product = { title: item.name }
 
         // return early if the product has external docs, like Atom