(ADO-500444) Deprecate PSDSC for Linux

[michaeltlombardi]

PR Summary

PowerShell DSC for Linux is no longer supported. This change:

• Removes the content for Linux resources and getting started with PSDSC on Linux.
• Adds a new file clarifying the deprecation and end of support, and directs users to DSC and Azure machine configuration for continued use of PSDSC resources on Linux.
• Redirects the removed articles to the deprecation article.
• Sets the freshness cycle for PSDSC v1.1 and v2.0 content to 10 years.
• Updates the TOC for the v1.1 content to reflect the changes.
• Fixes AB#500444

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

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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[learn-build-service-prod]

Learn Build status updates of commit 087cb3c:

✅ Validation status: passed

File	Status	Preview URL	Details
.openpublishing.redirection.json	✅Succeeded	View (dsc-2.0) View (dsc-1.1) View (dsc-3.0)
dsc/docfx.json	✅Succeeded
dsc/docs-conceptual/dsc-1.1/getting-started/lnxGettingStarted.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/index.md	✅Succeeded	View (dsc-1.1)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxArchiveResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxEnvironmentResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxFileLineResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxFileResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxGroupResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxPackageResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxScriptResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxServiceResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxSshAuthorizedKeysResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/reference/resources/linux/lnxUserResource.md	✅Succeeded	n/a (file deleted or renamed)
dsc/docs-conceptual/dsc-1.1/resources/resources.md	✅Succeeded	View (dsc-1.1)
dsc/docs-conceptual/dsc-1.1/toc.yml	✅Succeeded	View (dsc-1.1)

For more details, please refer to the build report.

[sdwheeler]

LGTM