feat(server): export startServer function from pubsweet

src/index.js

@@ -2,6 +2,7 @@ const cron = require('node-cron')
 
 const BaseModel = require('@pubsweet/base-model')
 const authentication = require('pubsweet-server/src/authentication')
+const { startServer } = require('pubsweet-server')
 const logger = require('@pubsweet/logger')
 
 const app = require('./app')
@@ -13,5 +14,6 @@ module.exports = {
   cron,
   createJWT,
   logger,
+  startServer,
   BaseModel,
 }