Issues building UI for shiny app

Hey guys, I'm trying to build the UI for my shiny app entirely using HTML and CSS. I found this guide on the shiny website: Shiny - Build your entire UI with HTML
However, the example code used in this tutorial does not work, for example, the file "shiny.js" and "jquery.js" (shown in the screenshot) is nowhere to be found, they are not included in the tutorial, and without them, the HTML UI won't be able to connect to the server.R
Can anyone help me with this?

shiny.js is at this location