[DOCS] Adds What's New (#68918)

docs/index.asciidoc

@@ -26,8 +26,6 @@ include::accessibility.asciidoc[]
 
 include::limitations.asciidoc[]
 
-include::release-notes/highlights.asciidoc[]
-
 include::migration.asciidoc[]
 
 include::CHANGELOG.asciidoc[]

docs/migration.asciidoc

@@ -8,7 +8,7 @@ your application from one version of Kibana to another.
 
 * <<breaking-changes-8.0>>
 
-See also <<release-highlights>> and <<release-notes>>. 
+See also <<whats-new>> and <<release-notes>>. 
 --
 
 include::migration/migrate_8_0.asciidoc[]

docs/migration/migrate_8_0.asciidoc

@@ -9,7 +9,7 @@ your application to Kibana 8.0.
 
 coming[8.0.0]
 
-See also <<release-highlights>> and <<release-notes>>.
+See also <<whats-new>> and <<release-notes>>.
 
 * <<breaking_80_index_pattern_changes>>
 * <<breaking_80_setting_changes>>

docs/release-notes/highlights.asciidoc

@@ -1,13 +0,0 @@
-[[release-highlights]]
-= Release Highlights
-
-[partintro]
---
-This section summarizes the most important changes in each release. For the 
-full list, see <<release-notes>> and <<breaking-changes>>. 
-
-* <<release-highlights-8.0.0>>
-
---
-
-include::highlights-8.0.0.asciidoc[]

docs/user/index.asciidoc

@@ -1,5 +1,7 @@
 include::introduction.asciidoc[]
 
+include::whats-new.asciidoc[]
+
 include::getting-started.asciidoc[]
 
 include::setup.asciidoc[]

docs/user/whats-new.asciidoc

@@ -0,0 +1,14 @@
+[[whats-new]]
+== What's new in 8.0
+
+This section summarizes the most important changes in each release. For the 
+full list, see <<release-notes>> and <<breaking-changes>>. 
+
+coming[8.0.0]
+
+//NOTE: The notable-highlights tagged regions are re-used in the
+//Installation and Upgrade Guide
+
+// tag::notable-highlights[]
+
+// end::notable-highlights[]