restructure publishing section

docs/getting-started.md

 ---
 layout: default
 title: Getting Started
-has_children: true
+has_children: false
 nav_order: 2
 ---
 

docs/open-access-publishing.md → docs/oa-publishing.md

 ---
 layout: default
-title: Publishing and Licencing
-has_children: true
-nav_order: 9
+title: Open Access Publishing
+parent: Publishing and Licencing
+has_children: false
+nav_order: 2
 ---
 
 # Open Access Publishing

docs/publishing-licencing.md

+---
+layout: default
+title: Publishing and Licencing
+has_children: true
+nav_order: 9
+---
+
+# Publishing and Licencing
+{: .fs-9 }
+
+...
+{: .fs-6 .fw-300 }
+
+---
+
+More information coming soon
+{: .label .label-yellow }
+