Docs: replace AD-reset recipe with realistic Zerto failover walkthrough

The AD password reset endpoint was a poor fit for what people actually
need this server for. Replaced with a realistic Zerto post-failover
example that's much closer to the project's purpose:

- Update DNS A records for failed-over hostnames
- Wait for the VM to come up at the DR site
- PowerShell-remote into the VM and check / start critical services
- Notify Teams with the result

The flagship pattern is now: Zerto post-script (curl, fire-and-forget)
calls an Async webhook endpoint -> 202 in milliseconds -> Zerto's
failover sequence is never blocked. The server runs the actual work in
the background, with full output captured in the daily log.

A ready-to-use Zerto-side script ships at
scripts/examples/zerto-post-failover.ps1 - pure curl.exe (no
PowerShell modules), reads the bearer token from a file the ZVM
service account can read.

The installer now bundles scripts/examples/ alongside docs/ so the
example is also available locally at
C:\Program Files\WebhookServer\scripts\examples\.

Removed: docs/recipes/ad-password-reset.md.
Updated: docs/README.md, README.md, the recipe content itself.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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 pre/post scripts → AD / DNS update](recipes/zerto-pre-post-scripts.md) — the canonical reason this exists
+3. [Recipe: Zerto failover post-script → DNS + service checks](recipes/zerto-pre-post-scripts.md) — the canonical reason this exists
 
 ## Topical
 
@@ -19,11 +19,12 @@ Webhook Server is a Windows service that runs a script (PowerShell, cmd, or any
 
 ## Recipes (cookbook style)
 
-- [Zerto pre/post scripts → AD / DNS update](recipes/zerto-pre-post-scripts.md)
+- [Zerto failover post-script → DNS + service checks](recipes/zerto-pre-post-scripts.md) ← canonical use case
 - [GitHub-style HMAC-signed webhook](recipes/github-style-hmac.md)
-- [AD password reset endpoint](recipes/ad-password-reset.md)
 - [Pop UI on the user's desktop](recipes/ui-on-desktop.md)
 
+The flagship Zerto recipe also ships with a **ready-to-use Zerto-side post-script** at [`scripts/examples/zerto-post-failover.ps1`](../scripts/examples/zerto-post-failover.ps1).
+
 ## Reference
 
 - [GitHub repo](https://github.com/recklessop/webhook-server)