Add page to navigation.json file.
src
├── data
├── navigation
├── navigation.json
If page is internal only make sure to add "internal": true
to the navigation.json file for that item.
"your-product-on-ibm-cloud": {
"title": "Your product on IBM Cloud",
"internal": true,
"sub-nav": {
"catalog-entry": {
"title": "Catalog entry"
},