docs: move Kubernetes to core features (#4038)

docs/features/kubernetes/index.md

@@ -1,6 +1,7 @@
 ---
-id: kubernetes-in-backstage
-title: Kubernetes in Backstage
+id: overview
+title: Kubernetes
+sidebar_label: Overview
 description: Monitoring Kubernetes based services with the service catalog
 ---
 

microsite/sidebars.json

@@ -36,6 +36,11 @@
     ],
     "CLI": ["cli/index", "cli/commands"],
     "Core Features": [
+      {
+        "type": "subcategory",
+        "label": "Kubernetes",
+        "ids": ["features/kubernetes/overview"]
+      },
       {
         "type": "subcategory",
         "label": "Software Catalog",

mkdocs.yml

@@ -58,6 +58,8 @@ nav:
           - Using Cloud Storage: 'features/techdocs/using-cloud-storage.md'
           - Troubleshooting: 'features/techdocs/troubleshooting.md'
           - FAQ: 'features/techdocs/FAQ.md'
+      - Kubernetes:
+          - Overview: 'features/kubernetes/index.md'
   - Plugins:
       - Overview: 'plugins/index.md'
       - Existing plugins: 'plugins/existing-plugins.md'