[DOCS] Restores 7.0.0 release notes and highlights

docs/reference/index-shared4.asciidoc

@@ -4,3 +4,7 @@ include::how-to.asciidoc[]
 include::testing.asciidoc[]
 
 include::glossary.asciidoc[]
+
+include::release-notes/highlights.asciidoc[]
+
+include::release-notes.asciidoc[]

docs/reference/release-notes/highlights.asciidoc

@@ -1,5 +1,8 @@
 [[release-highlights]]
 = {es} Release Highlights
+++++
+<titleabbrev>Release Highlights</titleabbrev>
+++++
 
 [partintro]
 --