fix: invalid reference (#636)

Co-authored-by: Lars Francke <[email protected]>

Author: NickLarsenNZ

modules/concepts/pages/overview.adoc

@@ -47,7 +47,7 @@ Learn more about roles: xref:roles-and-role-groups.adoc[]
 [#deployment]
 == Deployment
 
-All operators and products run as containers in a xref:kubernetes.adoc[Kubernetes cluster]. The operators are deployed with stackablectl (the Stackable CLI) or Helm.
+All operators and products run as containers in a xref:ROOT:kubernetes.adoc[Kubernetes cluster]. The operators are deployed with stackablectl (the Stackable CLI) or Helm.
 
 image::deployment.drawio.svg[]
 
@@ -66,4 +66,4 @@ image::common_objects.drawio.svg[]
 
 These objects can be reused by all operators that support this feature. The S3 bucket only needs to be described once, and then it can be referenced in all products that support reading and/or writing from/to S3. Learn more about S3 configuration: xref:s3.adoc[].
 
-Similarly for the OpenPolicyAgent (OPA). Configuring it looks the same across all products. Learn more: xref:opa.adoc[].
+Similarly for the OpenPolicyAgent (OPA). Configuring it looks the same across all products. Learn more: xref:opa.adoc[].