doc(migration): Add reference to upcoming migration feature in 1.x Helm chart version (#179)

Signed-off-by: mike.reiche <mike@reiche.world>

Author: mreiche

docs/guides/administration/migrating-from-v4.md

@@ -24,6 +24,8 @@ To walk this migration end to end against a sandbox v5 stack before the producti
     names. See the [configuration reference](../../reference/configuration/properties.md)
     for the current property and environment variable names.
 
+If you are running OWASP Dependency Track in a Kubernetes environment, please see the *MIGRATION.md* within the [Helm chart](https://github.com/DependencyTrack/helm-charts).
+
 ## How the migration works
 
 The `v4-migrator` command-line tool runs three offline phases (**extract**, **transform**, **load**)