index.js: use ../static for static dir

Author: arpith

src/index.js

@@ -1,3 +1,4 @@
+import path from 'path';
 import express from 'express';
 import bodyParser from 'body-parser';
 import cors from 'cors';
@@ -12,7 +13,7 @@ import signup from './signup';
 const app = express();
 
 app.use(cors());
-app.use(express.static(`${__dirname}/static`));
+app.use(express.static(path.join(__dirname, '../static')));
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({ extended: false }));