Update landing page and TOC

[sdwheeler]

PR Summary

Update landing page and TOC

• Fixes AB#575907

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]

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[learn-build-service-prod]

Learn Build status updates of commit ff05efb:

✅ Validation status: passed

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

For more details, please refer to the build report.

[Copilot]

Pull request overview

Updates the docs-conceptual landing page and navigation structure to reflect module deprecations by reorganizing the overview content and moving deprecated module entries later in the TOC.

Changes:

• Reordered reference/docs-conceptual/toc.yml to move AIShell and Crescendo entries to the end.
• Updated reference/docs-conceptual/overview.md metadata date and reorganized the module list to separate deprecated modules.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
reference/docs-conceptual/toc.yml	Moves AIShell/Crescendo TOC entries to the bottom of the conceptual TOC.
reference/docs-conceptual/overview.md	Updates ms.date and groups Crescendo/AIShell under a new deprecated section.

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