Light Version

HTML
You can simply change layout mode to Dark by doing the below changes in the file src/html/default/partials/body.html.
Simply set the attribute data-layout-mode="light" to the html tag. It will update the layout mode to light mode. No need to change any css or js files.

Laravel
To have dark mode enabled, replace the reference of bootstrap-dark.min.css stylesheet file to bootstrap.min.css and app-dark.min.css to app.min.css
in the resources/views/layouts/head-css.blade.php.