Drop Windows-ZVM recipe; ZVMA is now the canonical Zerto example

The Windows ZVM is largely deprecated in favor of the ZVMA on
Kubernetes, so the older recipe and its companion sender script are
gone. The ZVMA recipe is promoted to canonical and its header no
longer references the deleted recipe.

- delete docs/recipes/zerto-pre-post-scripts.md (Windows-ZVM-only)
- delete scripts/examples/zerto-post-failover.ps1 (curl.exe sender)
- promote ZVMA recipe in README, docs/README, installation, sync-wiki

If anyone still needs the DNS-update / service-check handler from
the deleted recipe it's available in git history (commit before this
one). Happy to re-resurrect into a generic post-failover recipe if
folks ask.

docs/README.md

@@ -6,7 +6,7 @@ Webhook Server is a Windows service that runs a script (PowerShell, cmd, or any
 
 1. [Concepts](concepts.md) — five-minute read on what a webhook is and how this server uses one
 2. [Installation](installation.md) — download, install, first endpoint
-3. [Recipe: Zerto failover post-script → DNS + service checks](recipes/zerto-pre-post-scripts.md) — the canonical reason this exists
+3. [Recipe: Zerto ZVMA pre/post → notify + VM health check](recipes/zerto-zvma-pre-post.md) — the canonical reason this exists
 
 ## Topical
 
@@ -19,12 +19,11 @@ Webhook Server is a Windows service that runs a script (PowerShell, cmd, or any
 
 ## Recipes (cookbook style)
 
-- [Zerto failover post-script → DNS + service checks](recipes/zerto-pre-post-scripts.md) ← canonical use case (Windows ZVM)
-- [Zerto ZVMA (Kubernetes) pre/post → notify + VM health check](recipes/zerto-zvma-pre-post.md) — same pattern for the in-cluster scripts-service
+- [Zerto ZVMA (Kubernetes) pre/post → notify + VM health check](recipes/zerto-zvma-pre-post.md) ← canonical use case
 - [GitHub-style HMAC-signed webhook](recipes/github-style-hmac.md)
 - [Pop UI on the user's desktop](recipes/ui-on-desktop.md)
 
-The flagship Zerto recipe ships with a ready-to-use Zerto-side post-script at [`scripts/examples/zerto-post-failover.ps1`](../scripts/examples/zerto-post-failover.ps1). The ZVMA recipe ships with [`zerto-zvma-send.ps1`](../scripts/examples/zerto-zvma-send.ps1) (sender) plus [`zerto-receiver-notify.ps1`](../scripts/examples/zerto-receiver-notify.ps1) and [`zerto-receiver-vm-healthcheck.ps1`](../scripts/examples/zerto-receiver-vm-healthcheck.ps1) (receivers).
+The Zerto ZVMA recipe ships with [`zerto-zvma-send.ps1`](../scripts/examples/zerto-zvma-send.ps1) (sender, runs inside the ZVMA `scripts-service` container) plus [`zerto-receiver-notify.ps1`](../scripts/examples/zerto-receiver-notify.ps1) and [`zerto-receiver-vm-healthcheck.ps1`](../scripts/examples/zerto-receiver-vm-healthcheck.ps1) (receivers, run on the Webhook Server host).
 
 ## Reference