Updates supported platforms

Author: jmagak

titles/discover/master.adoc

@@ -0,0 +1,14 @@
+include::artifacts/attributes.adoc[]
+:context: title-discover
+:doctype: book
+:imagesdir: images
+:title: Discover
+:subtitle: Introduction to {product}
+:abstract: {product} is a developer platform designed to build developer portals. Use {product} to provide a streamlined development environment with a centralized software catalog to build high-quality software efficiently. 
+
+//[id="{context}"]
+//= {title}
+
+//{abstract}
+
+include::assemblies/assembly-about-rhdh.adoc[]