Add topics to the menu

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

docs/deprecated.md

@@ -1,8 +1,11 @@
 <!--[metadata]>
 +++
-title = "registry deprecation"
+title = "Deprecated Features"
 description = "describes deprecated functionality"
 keywords = ["registry, manifest, images, signatures, repository, distribution, digest"]
+[menu.main]
+parent="smn_registry_ref"
+weight=8
 +++
 <![end-metadata]-->