If all this is too complicated for you, several websites provide pre-built Bootstrap themes, or else simplified tools to generate a Bootstrap build. To get our feet wet, let's download a theme from Bootswatch (https://bootswatch.com/). This is both a collection of free and open source themes and a build system for generating custom Bootstrap themes (https://github.com/thomaspark/bootswatch/).
Let's use the Minty theme from Bootswatch to explore the needed changes. You can download the theme from the website or add the following to the scripts section of package.json:
"dl-minty": "mkdir -p minty && npm run dl-minty-css && npm run dl-minty-min-css","dl-minty-css": "wget https://bootswatch.com/4/minty/bootstrap.css ...