Blazor auth topic enhancements

[guardrex]

Per @tdykstra #12853 (review) ...

This is a great start for auth documentation. It leans pretty heavily on the reader knowing ASP.NET Core auth already, though. It would be nice to have tutorials on implementing authn/authz in a server-side and in a client-side side project (in the latter case showing how to "Always perform authorization checks on the server within any API endpoints accessed by your client-side app."). Also it would be nice to have documentation on how to add auth to an existing non-auth project, instead of just saying start with an auth template.

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Document Details

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• ID: c9942b0a-a7fb-0d34-9201-af0963affa9e
• Version Independent ID: 19770710-5225-a1ea-e082-65da6ba4a49a
• Content: ASP.NET Core Blazor authentication and authorization
• Content Source: aspnetcore/security/blazor/index.md
• Product: aspnet-core
• Technology: aspnetcore-security
• GitHub Login: @guardrex
• Microsoft Alias: riande

[guardrex]

Cross-linking a few existing topics for authn/authz ...

• Social login provider tokens+claims for Blazor auth
• Google Social login provider for Blazor
• Token Based Authorization using IdentityServer with Blazor
• Signalr Context.User missing on hub
• Logout Flow
• Blazor and multiple auth providers
• How to Access Windows Auth User, when in C# Model?

... and sample app for tokens in Blazor Server: https://github.com/javiercn/blazor-server-aad-sample