Shows how to use NProgress to show a progress bar when doing any client-side navigation.
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It shows how to load NProgress, link to their styles from the node_modules folder, and use the useTransition hook to know when a client-side transition, both submit or navigation, is happening to start the progress bar.
To visualize it, the / route has a link to /slow-page whose loader takes one second to load so the progress bar is noticiable for more time