docs: add MDM rollout use case under Use Cases → Deployment (#1029)

* docs: add MDM fleet rollout use case

The MDM reference pages cover installing the client and enforcing its
settings separately, per OS and per vendor, but nothing walks through a
whole rollout. This use case ties install, SSO enrollment, policy, and
update ownership together, with an end-to-end Intune example for Windows
and macOS, and links out to the reference pages for detail.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JM8WrDg3kV1PQriXwjmzCb

* docs: move MDM rollout under a Deployment use-case group

Group the MDM rollout guide under a new Deployment section in the Use
Cases sidebar. Reuse existing Intune, desktop app, and Intune compliance
screenshots in the walkthrough. Drop the iOS section and the "What this
does not do" section to keep the guide focused on Windows and macOS
laptops.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JM8WrDg3kV1PQriXwjmzCb

* docs: tighten MDM rollout use case for clarity and scan

Polish the fleet rollout page: shorter preamble, clearer policy and update guidance, Related tiles, and a plain checklist without the redundant recap.

* docs: align Intune Ignore app version with update owner

The rollout guide requires Yes when NetBird owns updates and No when Intune does. Document both options on the Intune deploy page so the two guides do not conflict.

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Brandon Hopkins <brandon@techhut.tv>

src/pages/manage/peers/mdm-deployment/intune-netbird-integration.mdx

@@ -187,7 +187,7 @@ Click `Next` to configure NetBird with the following details:
 - **Description**: NetBird
 - **Publisher**: NetBird
 - **App install context**: Device
-- **Ignore app version**: No (This ensures updates will be applied when available)
+- **Ignore app version**: No if Intune owns updates (so Intune applies new MSI versions). Yes if NetBird owns updates via [Automatic Updates](/manage/peers/auto-update), so Intune only checks that NetBird is installed. Pick one owner: see [Roll Out with MDM](/use-cases/deployment/mdm-rollout#step-5-pick-one-owner-for-updates).
 - **Command-line arguments**: Leave empty. The v0.75 MSI has no `AUTOSTART` property; manage launch at login with the `disableAutostart` MDM setting instead.
 - **Category**: Select any category that fits your needs (optional)
 - **Show this as a featured app in the Company Portal**: Yes