Restructure the page

Author: NataliaIvakina

modules/ROOT/content-nav.adoc

@@ -239,7 +239,8 @@
 
 * xref:procedures.adoc[]
 
-* xref:changes-deprecations-removals.adoc[]
+* Deprecations, removals, and changes
+** xref:changes-deprecations-removals.adoc[Neo4j 2025.xx]
 
 * xref:tutorial/index.adoc[]
 //** xref:tutorial/local-causal-cluster.adoc[]