How to link an existing Angular 2 app to Nodejs Server?

I have an Angular 2 app with this structure :
Structure of my Angular app

Then in server side : Structure of server app

I see that there is 2 module dependencies folders, but I don't know which one I sould keep.

Here is my index.js file :

  const express = require('express');
  const path = require('path');
  const http = require('http');
  const bodyParser = require('body-parser');

  // Get our API routes
  //const api = require('./server/routes/api');

  const app = express();

  // Parsers for POST data
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: false }));

  // Point static path to dist
  app.use(express.static(path.join(__dirname, 'client/portfolio')));

  // Set our api routes
  //app.use('/api', api);

  // Catch all other routes and return the index file
  app.get('*', (req, res) => {
    res.sendFile(path.join(__dirname, 'client/portfolio/src/index.html'));
  });

  /**
   * Get port from environment and store in Express.
   */
  const port = process.env.PORT || '3001';
  app.set('port', port);

  /**
   * Create HTTP server.
   */
  const server = http.createServer(app);

  /**
   * Listen on provided port, on all network interfaces.
   */
  server.listen(port, () => console.log(`API running on localhost:${port}`));

When I start server I get this message :

Loading AppComponent content here ...

But it stops here and doesn't render the Angular application.

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