Update default site page

[sdwheeler]

PR Summary

Update default site page

• Fixes AB#548951

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

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[Copilot]

Pull request overview

This PR updates the main conceptual overview page for PowerShell utility modules to reflect current status and deprecation information. It refreshes the metadata date and clearly marks AIShell as deprecated.

Changes:

• Updated ms.date to reflect the January 2026 refresh of the overview page.
• Adjusted the module list to move AIShell and annotate it as deprecated as of January 2026.

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[learn-build-service-prod]

Learn Build status updates of commit 26a4b31:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/overview.md	✅Succeeded	View (ps-modules)

For more details, please refer to the build report.