Chore: Use autogenerated index rather than manual one.

This is a simplification, also avoiding the need to manually add future docs
in the IaaS deployment examples.
It also addresses the missing sidebar link to deploying CiaB in a VM
(#296).

Signed-off-by: Kurt Garloff <kurt@garloff.de>

sidebarsDocs.js

@@ -57,16 +57,8 @@ const sidebarsDocs = {
           },
           items: [
             {
-              type: 'doc',
-              id: 'iaas/deployment-examples/artcodix/index'
-            },
-            {
-              type: 'doc',
-              id: 'iaas/deployment-examples/testbed'
-            },
-            {
-              type: 'doc',
-              id: 'iaas/deployment-examples/cloud-in-a-box/index'
+              type: 'autogenerated',
+              dirName: '02-iaas/deployment-examples' // '.' means the current docs folder
             }
           ]
         }