Delete server.js (replaced to app.js)

-const express = require('express');
-const app = express();
-
-app.listen(8080, function(){
-    console.log('listening on 8080');
-});
-
-app.get('/test', function(req, res){
-    res.send('test');
-});
-
-app.get('/', function(req, res){
-    res.sendFile(__dirname + '/main.html');
-    res.sendFile(__dirname + '/main.css');
-});
\ No newline at end of file