Roll Blazor into the Simple Auth article

[guardrex]

Fixes #35816

• General guidance and example improvements.
• Add ✨ Blazor goodness ✨.
• Drop the RP sample app ... not necessary ... bloating the repo ... not maintained.
• Establish MVC and RP security nodes (per DR guidance, see below).

cc: @tdykstra (article metadata author) and @wadepickett for discussion

Dan stated (and confirmed offline) ...

For consistency, this content should be consolidated into authn-and-authz docs that live under the corresponding areas for those technologies. In cases where we use these technologies to demonstrate general authorization concepts, we should instead use Minimal APIs & Blazor to demonstrate those concepts.

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Internal previews

📄 File	🔗 Preview link
aspnetcore/mvc/security/authorization/simple.md	aspnetcore/mvc/security/authorization/simple
aspnetcore/razor-pages/index.md	aspnetcore/razor-pages/index
aspnetcore/razor-pages/security/authorization/simple.md	aspnetcore/razor-pages/security/authorization/simple
aspnetcore/security/authentication/identity-configuration.md	aspnetcore/security/authentication/identity-configuration
aspnetcore/security/authentication/identity.md	aspnetcore/security/authentication/identity
aspnetcore/security/authentication/index.md	aspnetcore/security/authentication/index
aspnetcore/security/authorization/policies.md	aspnetcore/security/authorization/policies
aspnetcore/security/authorization/secure-data.md	aspnetcore/security/authorization/secure-data
aspnetcore/security/authorization/simple.md	aspnetcore/security/authorization/simple
aspnetcore/toc.yml	aspnetcore/toc

[Copilot]

Pull request overview

This PR refactors the "Simple authorization" article (aspnetcore/security/authorization/simple.md) to center on Blazor Razor component examples, per the guidance from issue #35816 to consolidate authorization content under corresponding technology areas. Two new companion articles are created for MVC and Razor Pages, the old .NET Core 3.1 Razor Pages sample app is deleted, and cross-reference links throughout the repo are updated.

Changes:

• Rewrites the main simple.md article to focus on Blazor, with new MVC (mvc/security/authorization/simple.md) and Razor Pages (razor-pages/security/authorization/simple.md) articles for technology-specific guidance.
• Adds "Security and Identity > Authorization" TOC nodes under both the Razor Pages and MVC sections.
• Replaces all [!INCLUDE[](~/includes/requireAuth.md)] usages with inline <xref:> links and deletes the now-unused include file and the 3.1 sample app.

Reviewed changes

Copilot reviewed 38 out of 47 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
aspnetcore/security/authorization/simple.md	Rewritten to use Blazor examples; links to new MVC/RP articles
aspnetcore/mvc/security/authorization/simple.md	New MVC-specific simple authorization article
aspnetcore/razor-pages/security/authorization/simple.md	New Razor Pages-specific article with handler authorization guidance
aspnetcore/toc.yml	Adds Security and Identity > Authorization nodes under Razor Pages and MVC
aspnetcore/security/authorization/secure-data.md	Updates #rau anchor links to #require-authenticated-users
aspnetcore/security/authorization/policies.md	Replaces requireAuth.md include with inline xref
aspnetcore/security/authorization/policies/includes/policies5.md	Replaces requireAuth.md include with inline xref
aspnetcore/security/authentication/index.md	Updates #rau anchor links to #require-authenticated-users
aspnetcore/security/authentication/identity.md	Replaces requireAuth.md include with inline xref
aspnetcore/security/authentication/identity/includes/identity6.md	Replaces requireAuth.md include with inline xref
aspnetcore/security/authentication/identity-configuration.md	Replaces requireAuth.md include with inline xref
aspnetcore/razor-pages/index.md	Updates link text/anchor for Razor Pages auth section
aspnetcore/razor-pages/index/includes/index35.md	Updates link text/anchor for Razor Pages auth section
aspnetcore/includes/requireAuth.md	Deleted (no longer used)
aspnetcore/security/authorization/simple/samples/3.1/PageHandlerAuth/*	Deleted old sample app (many files)

[Copilot]

@guardrex I've opened a new pull request, #36839, to work on those changes. Once the pull request is ready, I'll request review from you.

[tdykstra]

A few suggestions, nothing major