[DOCS] Build Kibana Guide from kibana repo (elastic#16450)

README.md

@@ -53,6 +53,8 @@ For the daring, snapshot builds are available. These builds are created nightly
 
 Visit [Elastic.co](http://www.elastic.co/guide/en/kibana/current/index.html) for the full Kibana documentation.
 
+For information about building the documentation, see the README in [elastic/docs](https://github.com/elastic/docs).
+
 ## Version Compatibility with Elasticsearch
 
 Ideally, you should be running Elasticsearch and Kibana with matching version numbers. If your Elasticsearch has an older version number or a newer _major_ number than Kibana, then Kibana will fail to run. If Elasticsearch has a newer version than Kibana, then the Kibana Server will log a warning.

docs/index.x.asciidoc

@@ -0,0 +1,10 @@
+[[kibana-guide]]
+= Kibana User Guide
+
+:include-xpack:  true
+:lang:           en
+:kib-repo-dir:   {docdir}
+:xes-repo-dir:   {docdir}/../../elasticsearch-extra/x-pack-elasticsearch/docs/{lang}
+:xkb-repo-dir:   {docdir}/../../kibana-extra/x-pack-kibana/docs/{lang}
+
+include::{xkb-repo-dir}/index.asciidoc[]