search: add ROSA search support

* Adds the new ROSA documentation search label.
* Adds the current version value for the ARO search label so that v3
  results are not returned when searching the almost empty ARO 4 docs.

Signed-off-by: Jiri Fiala <[email protected]>

Author: jiri-fiala

_templates/_page_openshift.html.erb

@@ -188,7 +188,8 @@
     'openshift-dedicated': ['docs_dedicated', version],
     'openshift-online': ['docs_online', version],
     'openshift-enterprise': ['docs_cp', version],
-    'openshift-aro' : ['docs_aro']
+    'openshift-aro' : ['docs_aro', version],
+    'openshift-rosa' : ['docs_rosa']
   };
 
   distros[dk] ? hcSearchCategory.apply(null, distros[dk]) : hcSearchCategory("docs");