Add link from releases index to archived releases

Author: mdlinville

content/release-notes/_index.md

@@ -11,7 +11,7 @@ menu:
     weight: 5
 ---
 
-This section includes release notes for supported W&B Server releases.
+This section includes release notes for supported W&B Server releases. For releases that are no longer supported, refer to [Archived releases]({{< relref "archived/" >}}).
 
 <a href="/release-notes/releases/index.xml"><button class="btn btn-primary mb-4 feedback--answer"><i class="fa-sharp fa-regular fa-square-rss" alt="RSS icon"></i>&nbsp;RSS feed</button></a>