The last article you've linked to is indeed missing the instructions for the client libraries. We'll get right on that.
It's Microsoft's approach to use NuGet to serve only server resources, and to defer the client styles and scripts to another package manager (you can see this yourself, when you create a new vanilla ASP.NET Core application - the jQuery and Bootstrap are loaded through libman, and formally bower). So in order to get the client resources you would need to use one of the tree approaches, described in the article
. The manual step requires you to download the ASP.NET Core zip package from your account download page (not the nuget file), since the NuGet package doesn't include them.
Hope this was helpful.
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