fix issue with the news page

docs/merlin6/introduction.md

@@ -1,12 +1,14 @@
-# Merlin 6 Cluster
+# Introduction
+
+!!! note
+    Merlin6 is no longer accessible for new users! Please have a look at [Merlin 7](../../merlin7/01-Quick-Start-Guide/introduction.md) instead.
 
 ## Slurm clusters
 
-* The new Slurm CPU cluster is called **`merlin6`**.
-* The new Slurm GPU cluster is called [**`gmerlin6`**](../gmerlin6/cluster-introduction.md)
-* The old Slurm *merlin* cluster is still active and best effort support is provided.
-
-The cluster, was renamed as [**merlin5**](../merlin5/cluster-introduction.md).
+Comprised the **`merlin6`** CPU cluster and the
+[**`gmerlin6`**](../gmerlin6/cluster-introduction.md) GPU cluster. A legacy
+cluster (formally called [**`merlin5`**](../merlin5/cluster-introduction.md) is
+kept active with best effort support.
 
 From July 2019, **`merlin6`** becomes the **default Slurm cluster** and any job submitted from the login node will be submitted to that cluster if not.
 

mkdocs.yml

@@ -124,7 +124,7 @@ nav:
       - merlin7/99-support/migration-from-merlin6.md
       - merlin7/99-support/contact.md
   - Merlin 6:
-    - merlin6/index.md
+    - merlin6/introduction.md
     - merlin6/hardware-and-software-description.md
     - merlin6/slurm-configuration.md
     - Quick Start Guide: