It depends, there are many solutions to this.
You could create your own CDN (makes sense if you're not using HTTP/2)
You could use the provided CDN (please use a subresource integrity check)
You could combine the assets using a build system and serve that file (I recommend using some kind of cache busting and cache that big file locally)
Or just install the dependencies and serve them directly, it all depends how much effort you want to put into this and what you think it's gonna be valuable for you.
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