chore: Upgrade Babel, Jest, Eslint (#1437)

* chore: Upgrade Prettier 1.8 -> 2.0

* chore: Upgrade Babel 6 -> 7

* chore: Upgrade eslint plugins

* chore: Add eslint import/order rules

* chore: Update flow-typed deps

server/commands/documentMover.js

@@ -1,7 +1,7 @@
 // @flow
+import { type Context } from "koa";
 import { Document, Collection, Event } from "../models";
 import { sequelize } from "../sequelize";
-import { type Context } from "koa";
 
 export default async function documentMover({
   user,