add clusters to toc under clusters section, update some links

Author: bcumming

docs/clusters/besso.md

@@ -1,10 +1,8 @@
 [](){#ref-cluster-besso}
 # Besso
 
-Besso is an Alps cluster that provides development resources for porting software for selected customers.
-
-!!! note
-    Besso is a small system for development work for selected customers.
+Besso is a small Alps cluster that provides development resources for porting software for selected customers.
+It is provided as is, without the same level of support as the main platform clusters.
 
 ### Storage and file systems
 

docs/alps/clusters.md renamed to docs/clusters/index.md

@@ -30,15 +30,15 @@ Find out more about Alps...
 
     Learn more about the Alps research infrastructure
 
-    [:octicons-arrow-right-24: Alps Overview](alps/index.md)
+    [:octicons-arrow-right-24: Alps Overview][ref-alps]
 
     Get detailed information about the main components of the infrastructure
 
-    [:octicons-arrow-right-24: Alps Clusters](alps/clusters.md)
+    [:octicons-arrow-right-24: Alps Clusters][ref-alps-clusters]
 
-    [:octicons-arrow-right-24: Alps Hardware](alps/hardware.md)
+    [:octicons-arrow-right-24: Alps Hardware][ref-alps-hardware]
 
-    [:octicons-arrow-right-24: Alps Storage](alps/storage.md)
+    [:octicons-arrow-right-24: Alps Storage][ref-alps-storage]
 
 -   :fontawesome-solid-key: __Logging In__
 

docs/index.md

@@ -17,7 +17,14 @@ nav:
   - 'Alps':
     - alps/index.md
     - 'Platforms': alps/platforms.md
-    - 'Clusters': alps/clusters.md
+    - 'Clusters':
+      - clusters/index.md
+      - 'Besso': clusters/besso.md
+      - 'Bristen': clusters/bristen.md
+      - 'Clariden': clusters/clariden.md
+      - 'Daint': clusters/daint.md
+      - 'Eiger': clusters/eiger.md
+      - 'Santis': clusters/santis.md
     - 'Hardware': alps/hardware.md
     - 'Storage': alps/storage.md
     - 'Machine Learning Platform':