Updated Express code to serve assets (#4402)

Assets where not served so the style was not applied, fixed this by adding the line app.use(express.static('dist/client/'))

packages/integrations/node/README.md

@@ -57,6 +57,7 @@ import express from 'express';
 import { handler as ssrHandler } from './dist/server/entry.mjs';
 
 const app = express();
+app.use(express.static('dist/client/'))
 app.use(ssrHandler);
 
 app.listen(8080);