Recategorise USWDS from Web frameworks to UI frameworks

Right now USWDS is displayed amongst [Web frameworks](https://www.wappalyzer.com/technologies/web-frameworks). It’s a design system, with no server-side code, and even client-side it doesn’t help structure applications – it’s just an assortment of components. So I think it would be better to see it amongst [UI frameworks](https://www.wappalyzer.com/technologies/ui-frameworks), like Bootstrap, or other design systems.