Add AIMS2 docs to manually-defined MKdocs index

When adding the first AIMS2 docs I did not add them to the index, as I did not realise they are not autogenerated but manually added.

mkdocs.yml

@@ -40,6 +40,11 @@ nav:
         - 'Adding users to koji': koji/addingusers.md
         - 'Untagging policy': koji/untagging.md
     - AIMS2:
+        - 'AIMS2 ': aims2/aims2.md
+        - 'AIMS2 server': aims2/aims2server.md
+        - 'AIMS2 client': aims2/aims2client.md
+        - 'AIMS2 how to': aims2/aims2how2.md
+        - 'AIMS2 prepare': aims2/aims2prepare.md
         - 'Adding a new image': aims2/addinganewimage.md
     - 'Community':
         - CentOS: community/centos.md