documented supported product versions (#106)

## Description

fixes #36



Co-authored-by: Malte Sander <malte.sander.it@gmail.com>

Author: maltesander

docs/modules/ROOT/pages/index.adoc

@@ -4,6 +4,14 @@ This is an operator for Kubernetes that can manage https://hive.apache.org[Apach
 
 WARNING: This operator only works with images from the https://repo.stackable.tech/#browse/browse:docker:v2%2Fstackable%2Fhive[Stackable] repository
 
+== Supported Versions
+
+The Stackable Operator for Apache Hive currently supports the following versions of Hive:
+
+include::partial$supported-versions.adoc[]
+
+== Docker
+
 [source]
 ----
 docker pull docker.stackable.tech/stackable/hive:<version>

docs/modules/ROOT/partials/supported-versions.adoc

@@ -0,0 +1,5 @@
+// The version ranges supported by Hive-Operator
+// This is a separate file, since it is used by both the direct Hive-Operator documentation, and the overarching
+// Stackable Platform documentation.
+
+- 2.3.9