Add deprecation tag (#3922)

* Add deprecation tag

* match docsContent styling in dialog

_includes/feature-dialog.md

@@ -1,5 +1,5 @@
 <a href="#" id="feature-state-dialog-link" class="ui-state-default ui-corner-all"><span class="ui-icon ui-icon-newwin"></span>{{ dialog_title }}</a>
-<div id="feature-state-dialog" title="{{ dialog_title }}">
+<div id="feature-state-dialog" class="ui-dialog-content" title="{{ dialog_title }}">
 {{ dialog_content | markdownify }}
 </div>
 {% raw %}<script>

_includes/feature-state-deprecated.md

@@ -0,0 +1,6 @@
+{% assign dialog_title = "deprecated" %}
+{% capture dialog_content %}
+This feature is *deprecated*. See [Deprecating parts of the API](/docs/reference/deprecation-policy/#deprecating-parts-of-the-api) for more information.
+{% endcapture %}
+
+**DEPRECATION NOTICE:** As of `Kubernetes {{ for_k8s_version | default: page.version }}` this feature is {% include feature-dialog.md %}