Remove Firebase hosting, back to Express

modules/utils/fetchNpmPackageInfo.js

@@ -1,12 +1,13 @@
 import url from 'url';
 import https from 'https';
 
-import { npmRegistryURL } from '../config';
-
 import debug from './debug';
 import bufferStream from './bufferStream';
 import agent from './registryAgent';
 
+const npmRegistryURL =
+  process.env.NPM_REGISTRY_URL || 'https://registry.npmjs.org';
+
 function parseJSON(res) {
   return bufferStream(res).then(JSON.parse);
 }