[Cookbook][Web Server] add sidebar for the built-in server in VMs

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | 

As discussed with @weaverryan in #4000, this pull request adds a sidebar which explains how to easily use the built-in web server in virtual machines to make it accessible from the host machine.