Add a remark on the use of HttpContext in the sample apps

[guardrex]

Description

Per feedback at dotnet/blazor-samples#258, add a section that explains the use of HttpContext is permitted for static SSR and root components. Cross-link the INCLUDE in the interactive SSR security article ...

https://learn.microsoft.com/en-us/aspnet/core/blazor/security/server/interactive-server-side-rendering?view=aspnetcore-8.0#ihttpcontextaccessorhttpcontext-in-razor-components

Thanks @nwoolls! 🚀 ... I'll get some coverage up for it. BTW, it's always best to open doc issues here from the bottoms of the articles using the Open a documentation issue link. This is our main working repo. Thanks for reaching out on this.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/blazor/security/blazor-web-app-with-oidc?view=aspnetcore-8.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/security/blazor-web-app-with-oidc.md

Document ID

c3346d3a-346b-8db4-2650-ec044b3f0dd9

Article author

@guardrex