Static files overhaul

[guardrex]

Fixes #35810
Fixes #35833

Dan ... I'll ping Javier for a technical review after I get your feedback. Next, I'll ping Wade and Tom.

Notes

• Let's combine articles. IMO, it's kind'a scatter-🧠 to have two static files articles.
• 'Look ma! No broken links!' 😆 Let's drop the horribad INCLUDES versioning for two great outcomes ...
  • Links aren't broken in prior-version content.
  • The team and community are prevented from only updating the latest version of the article. That will still be a problem if we ever go to group-topic versioning (aka "Version-by-file"), but I don't think that's ever going to happen. If we're on the current versioning model forever, this approach stops the poor practice of only making bug fixes to the latest release content (i.e., INCLUDES files are routinely ignored for bug and enhancement updates).
• Let's move the samples into the dotnet/AspNetCore.Docs.Samples repo where they belong. The sample apps were placed in that repo on Add static files sample apps AspNetCore.Docs.Samples#282. I'll delete them from this repo on this PR after reviews to avoid cluttering the diff.
• We're still running with the separate Blazor Static Files article with Blazor-focused scenarios. Dan, I can move that content (or selected bits of it) into this article if you want. 👂

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Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/fundamentals/static-files.md	aspnetcore/blazor/fundamentals/static-files
aspnetcore/fundamentals/static-files.md	aspnetcore/fundamentals/static-files
aspnetcore/toc.yml	aspnetcore/toc