mdbootstrap/mdb-ui-kit ? reverse-engineered prompt

Build me a Bootstrap 5 style UI kit with a Material Design look and feel, something I can drop into a website and start using right away.

I want a clean demo page that shows off the main components people would expect, like buttons, cards, forms, navbars, alerts, modals, carousels, spinners, and a few layout examples. It should feel polished and modern, with a lot of ready to use styles, but still be easy to customize. Please make it work with plain JavaScript and keep the setup simple, so someone can open it and see the components in action without a lot of extra work.

Use a structure that would make sense for a reusable front end kit, include the styling and scripts needed for the components, and make the page look good on desktop and mobile. If you need to check current Bootstrap docs or examples online while building, go ahead and do that.