Remove section header links

mkdocs.yml

@@ -133,9 +133,8 @@ nav:
     - Support:
       - merlin7/99-support/migration-from-merlin6.md
   - Merlin 6:
-    - Introduction:
-      - merlin6/introduction.md
     - Quick Start Guide:
+      - merlin6/introduction.md
       - merlin6/quick-start-guide/code-of-conduct.md
       - merlin6/quick-start-guide/requesting-accounts.md
       - merlin6/quick-start-guide/requesting-projects.md
@@ -182,14 +181,14 @@ nav:
       - merlin6/software-support/paraview.md
       - merlin6/software-support/python.md
   - MeG:
-    - meg/index.md
+    - meg/introduction.md
     - meg/contact.md
     - meg/migration-to-merlin7.md 
   - PSI@CSCS:
-    - cscs-userlab/index.md
+    - cscs-userlab/introduction.md
     - cscs-userlab/transfer-data.md
   - Support:
-    - support/index.md
+    - support/introduction.md
     - support/faq.md
     - support/known-problems.md
     - support/troubleshooting.md