Make release notes a dropdown in the navbar

Author: paigecalvert

docusaurus.config.js

@@ -95,10 +95,36 @@ const config = {
         },
         items: [
           {
-            type: 'doc',
+            type: 'dropdown',
             label: 'Release Notes',
             position: 'left',
-            docId: 'release-notes/rn-whats-new'
+            items: [
+              {
+                type: 'doc',
+                docId: 'release-notes/rn-embedded-cluster',
+                label: 'Embedded Cluster',
+              },
+              {
+                type: 'doc',
+                docId: 'release-notes/rn-app-manager',
+                label: 'KOTS',
+              },
+              {
+                type: 'doc',
+                docId: 'release-notes/rn-kubernetes-installer',
+                label: 'kURL',
+              },
+              {
+                type: 'doc',
+                docId: 'release-notes/rn-replicated-sdk',
+                label: 'Replicated SDK',
+              },
+              {
+                type: 'doc',
+                docId: 'release-notes/rn-vendor-platform',
+                label: 'Vendor Platform',
+              },
+            ],  
           },
           {
             type: 'dropdown',