add scroll to text fragment/highlight

[McNerdius]

This: https://github.com/WICG/scroll-to-text-fragment/
In Action

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Presumably broken in Blazor for the same reason as hash-navigation, recreating it in the same way (navigationmanager hook + js) would be needed ?

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The Using Edge's "Copy link to highlight" for the /build page, we get a link like https://localhost:5001/build#:~:text=Tailwind%20Incremental%20Builds.

The :~:text=... is being stripped off, it's not included in NavigationManager.Uri or LocationChangedEventArgs.Location. AnchorNavigationHook intercepts anything with a # but doesn't get the highlight bits.