[DOCS] The front-end deployment information is not correct

[razvanilin]

pm2 serve is for serving static sites and it will give a 404 if the user refreshes the page.

pm2 should instead use the external serve module to serve the site and for this it needs a configuration file like so:

{
  apps : [
    {
      name      : "chartbrew-client",
      script    : "npx",
      interpreter: "none",
      args: "serve -s . -p 5100"
    }
  ]
}