[DOCS] Create install-upgrade folder (#196)

Author: lcawl

docs/index.asciidoc renamed to docs/en/install-upgrade/index.asciidoc

@@ -1,7 +1,11 @@
 [[elastic-stack]]
 = Elastic Stack
 
-include::{docdir}/../../elasticsearch/docs/Versions.asciidoc[]
+:es-repo-dir:        {docdir}/../../../../elasticsearch/docs
+:kib-repo-dir:       {docdir}/../../../../kibana/docs
+
+include::{asciidoc-dir}/../../shared/attributes.asciidoc[]
+include::{es-repo-dir}/Versions.asciidoc[]
 
 == Overview