Added previous versions link to 1.8 GH repo.

Author: michael.wallis

_data/sidebars/docs_sidebar.yml

@@ -355,9 +355,7 @@ entries:
        url: /task_hci_snswitches.html
      - title: Replace storage node in a two-node cluster
        url: /task_hci_2noderepl.html
-  - title: Previous versions
-    entries:
-     - title: NetApp HCI 1.8P1
-       url: http://docs.netapp.com/us-en/hci18/docs/index.html
+  - title: Earlier versions
+    url: /reference_earlier_versions.html
   - title: Legal notices
     url: /reference_notices_hci.html

docs/reference_earlier_versions.adoc

@@ -0,0 +1,18 @@
+---
+sidebar: sidebar
+permalink: docs/reference_earlier_versions.html
+keywords: documentation, earlier, previous, versions
+summary: Documentation for previous releases of NetApp HCI is available in case you're not running the latest version.
+---
+
+= Earlier versions of NetApp HCI documentation
+:hardbreaks:
+:nofooter:
+:icons: font
+:linkattrs:
+:imagesdir: ../media/
+
+[.lead]
+Documentation for previous releases of NetApp HCI is available in case you're not running the latest version.
+
+* http://docs.netapp.com/us-en/hci18/docs/index.html[NetApp HCI 1.8P1^]