docs: remove release engineering strategy from jumpstart kickoff

Remove all references to the release engineering strategy from the jumpstart kickoff documentation:
- Remove from design decisions list
- Remove from handoff calls list
- Update references to point to deprecated location

Author: Benbentwo

docs/jumpstart/kickoff.mdx

@@ -127,7 +127,6 @@ This document outlines what to expect from your first call with Cloud Posse. In
       - [ ] [Decide on CIDR Allocation Strategy](/layers/network/design-decisions/decide-on-cidr-allocation)
       - [ ] [Decide on Service Discovery Domain](/layers/network/design-decisions/decide-on-service-discovery-domain)
       - [ ] [Decide on Vanity Domain](/layers/network/design-decisions/decide-on-vanity-branded-domain)
-      - [ ] [Decide on Release Engineering Strategy](/layers/software-delivery/design-decisions/decide-on-release-engineering-strategy)
     </TaskList>
 
     <Admonition>
@@ -150,7 +149,6 @@ This document outlines what to expect from your first call with Cloud Posse. In
       - [Spacelift](/layers/spacelift) or [GitOps](/layers/gitops)
       - [ECS](/layers/ecs) or [EKS](/layers/eks)
       - [Monitoring](/layers/monitoring) and [Alerting](/layers/alerting)
-      - [Release Engineering](/layers/software-delivery)
       - Final Call (Sign-off)
     </TaskList>