add sidebar for the built-in server in VMs
feature #4340 [Cookbook][Web Server] add sidebar for the built-in server in VMs (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[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 | #4149

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.

Commits
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28645d9 add sidebar for the built-in server in VMs