RHIDP-6575 - Promote RHDH-local to Dev preview status in RHDH Docs (#1097)

* RHIDP-6575 - Promote RHDH-local to Dev preview status in RHDH Docs

* RHIDP-6575 - Promote RHDH-local to Dev preview status in RHDH Docs

* RHIDP-6575 - Promote RHDH-local to Dev preview status in RHDH Docs

* Update ref-release-notes-developer-preview.adoc

Remove RN Text that will be picked up from the Jira issue.

* Delete modules/release-notes/ref-release-notes-developer-preview.adoc

Delete ref-release-notes-developer-preview.adoc as this file will be re-generated by the RN script.

* Update title-rhdh-release-notes.adoc

Author: Gerry-Forde

artifacts/attributes.adoc

@@ -10,10 +10,12 @@
 :product: Red Hat Developer Hub
 :product-short: Developer Hub
 :product-very-short: RHDH
-:product-version: 1.5
-:product-bundle-version: 1.5.0
-:product-chart-version: 1.5.0
-:product-backstage-version: 1.35.0
+:product-local: Red Hat Developer Hub Local
+:product-local-very-short: RHDH Local
+:product-version: 1.6
+:product-bundle-version: 1.6.0
+:product-chart-version: 1.6.0
+:product-backstage-version: 1.36.1
 :product-custom-resource-type: Backstage
 :rhdeveloper-name: Red Hat Developer
 :rhel: Red Hat Enterprise Linux

titles/rel-notes-rhdh/title-rhdh-release-notes.adoc

@@ -20,6 +20,7 @@ include::modules/release-notes/ref-release-notes-deprecated-functionalities.adoc
 
 include::modules/release-notes/ref-release-notes-technology-preview.adoc[leveloffset=+1]
 
+//include::modules/release-notes/ref-release-notes-developer-preview.adoc[leveloffset=+1]
 
 include::modules/release-notes/ref-release-notes-fixed-issues.adoc[leveloffset=+1]