Refactor app.js to remove unnecessary CORS headers and security measures

server/src/app.js

@@ -1,28 +1,16 @@
 const express = require('express');
 const bodyParser = require('body-parser');
 const path = require('path');
-const cors = require('cors');
 const { initializeDatabase } = require('./config/database');
 const snippetRoutes = require('./routes/snippetRoutes');
 
 const app = express();
 const port = process.env.PORT || 5000;
 
-app.use(cors({
-  origin: true,
-  credentials: true
-}));
-
 app.use(bodyParser.json());
 app.use(express.static(path.join(__dirname, '../../client/build')));
 
 app.set('trust proxy', true);
-app.use((req, res, next) => {
-  res.header('X-Powered-By', null);
-  res.header('X-Frame-Options', 'SAMEORIGIN');
-  res.header('X-Content-Type-Options', 'nosniff');
-  next();
-});
 
 app.use('/api/snippets', snippetRoutes);