Reference Shells/Languages nav nesting

Summary

Under Reference, Shells and Languages were indented one level too deep in nav.adoc, so Antora treated them as children of Google Cloud OAuth concept map. With site-nav-tree promoteLinkedSectionLandings, that linked parent became an unlinked section wrapping those typology branches.

Changes

  • docs/modules/ROOT/nav.adoc: * Shells / Nushell and * Languages / * C Language → Shells / Nushell and Languages / * C Language (siblings of the OAuth concept map under Reference).

  • No site-nav-tree package change; root cause was content asterisks, not promoteLinkedSectionLandings itself.