📖 [Docs]: README pages now use the standard module landing-page format

[Marius Storhaug (MariusStorhaug)]

Admin's README is now a concise landing page that follows the standard PSModule module-README format, so users get what they need at a glance instead of duplicated command reference.

What changed

• Usage example restored — the README now shows how to use Test-Admin to detect whether the current session is elevated (administrator/root), including a guard-clause pattern for gating operations that require elevation.
• Install-PSResource — installation now uses Install-PSResource (the modern PSResourceGet cmdlet) instead of the deprecated Install-Module.
• Contributing section removed — community/contribution boilerplate no longer lives on the published landing page.
• Stale content dropped — the empty ## Acknowledgements placeholder (no real attribution) and the outdated PowerShell 5.1 prerequisite note were removed.

Landing-page shape

# Admin → one-paragraph overview → ## Installation → ## Usage → ## Documentation (links to psmodule.io/Admin plus a real Get-Command/Get-Help discovery snippet).

Technical details

• Updates README.md only.
• Aligns with the module-README standard from PSModule/Template-PSModule.

[Copilot]

Pull request overview

Standardizes the repository’s README.md into a lightweight landing page (installation + links), pushing detailed usage guidance toward PowerShell help and generated module documentation.

Changes:

• Replaces the detailed README usage section with links to published documentation and a minimal “discover commands / get help” snippet.
• Updates installation guidance and simplifies contribution text.

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[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
POWERSHELL	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

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Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
POWERSHELL	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

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

[Copilot]

Pull request overview

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

[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
POWERSHELL	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

All files and directories linted successfully

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[Copilot]

Pull request overview

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

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
POWERSHELL	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

All files and directories linted successfully

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