refactor: Remove babel/register for instant production server startup (#1481)

* refactor: Remove babel/register for instant production server startup

* fix: Update procfile location

* fix: package.json must be copied, not linked for production build

* fix: Production file paths

* fix: Public assets path

* Remove unused scripts

server/services/websockets.js

@@ -1,7 +1,7 @@
 // @flow
 import subHours from "date-fns/sub_hours";
-import { socketio } from "../";
 import type { Event } from "../events";
+import { socketio } from "../main";
 import {
   Document,
   Collection,