No duplicate title (#762)

Co-authored-by: Fabrice Flore-Thébault <[email protected]>

Author: openshift-cherrypick-robot

titles/about/master.adoc

@@ -1,6 +1,5 @@
 [id="title-about_red_hat_developer_hub"]
 include::artifacts/attributes.adoc[]
-= About {product}
 :imagesdir: images
 :title: About {product}
 :subtitle: Introduction to {product}