docs: redesigned navigation (#9525)

Redesign navigation bar to reflect new design and allow for dropdowns

Closes DX-943

www/apps/api-reference/app/layout.tsx

@@ -34,6 +34,7 @@ export default function RootLayout({
       bodyClassName={clsx(inter.variable, robotoMono.variable)}
       showToc={false}
       showBanner={false}
+      showBreadcrumbs={false}
     >
       {children}
     </WideLayout>