Update Windows setup guide to include how to turn off MDM (#26562)

Changes:
- Windows MDM setup guide update: include instructions how to turn off
MDM
- Redirect: new link `learn-more-about/windows-mdm` that will be used in
the error message.

articles/windows-mdm-setup.md

@@ -173,6 +173,13 @@ Once the automatic migration is enabled, Fleet sends a notification to each host
 
 You can track migration progress in Fleet. Learn how [here](https://fleetdm.com/guides/mdm-migration#check-migration-progress).
 
+## Turn off Windows MDM
+
+1. Turn off MDM for each host, by running [this script](https://github.com/fleetdm/fleet/blob/main/it-and-security/lib/windows/scripts/turn-off-mdm.ps1) on all your Windows hosts.
+2. Head to **Settings > Integrations > MDM**.
+3. In the **Mobile device management (MDM)** section, select **Edit** next to "Windows MDM turned on."
+4. Switch **Windows MDM on** to **Windows MDM off** and select **Save**.
+
 <meta name="articleTitle" value="Windows MDM setup">
 <meta name="authorFullName" value="Noah Talerman">
 <meta name="authorGitHubUsername" value="noahtalerman">

it-and-security/lib/windows/scripts/turn-off-mdm.ps1

@@ -1,3 +1,5 @@
+# Please don't delete. This script is referenced in the guide here: https://fleetdm.com/guides/windows-mdm-setup#turn-off-windows-mdm
+
 Add-Type -TypeDefinition @"
 using System;
 using System.Runtime.InteropServices;

website/config/routes.js

@@ -870,6 +870,7 @@ module.exports.routes = {
   'GET /learn-more-about/end-user-license-agreement': '/guides/macos-setup-experience#end-user-authentication-and-end-user-license-agreement-eula',
   'GET /learn-more-about/end-user-authentication': '/guides/macos-setup-experience#end-user-authentication-and-end-user-license-agreement-eula',
   'GET /learn-more-about/policy-templates': '/policies',
+  'GET /learn-more-about/windows-mdm': '/guides/windows-mdm-setup',
 
   // Sitemap
   // =============================================================================================================