Update ASP.NET Core fundamentals overview doc to highlight Blazor

[danroth27]

Description

The ASP.NET Core fundamentals doc currently shows MVC & Razor Pages. Instead, it should show Blazor for any frontend web development needs.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/?view=aspnetcore-8.0&tabs=macos

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/index.md

Document ID

8e663029-63b9-2622-f852-9f8a2ec70db3

Article author

@tdykstra

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Associated WorkItem - 289456

[danroth27]

@tdykstra Actually, looking through all of the ASP.NET Core fundamentals topics, it looks like we should do a general pass through those topics to shift them from Razor Pages to Blazor.