refactor(footer, header): remove unused components and clean up code

app/(marketing)/_components/site-header.tsx

@@ -5,7 +5,6 @@ import { Header } from '@kit/ui/marketing';
 import { AppLogo } from '~/components/app-logo';
 
 import { SiteHeaderAccountSection } from './site-header-account-section';
-import { SiteNavigation } from './site-navigation';
 
 export function SiteHeader({
   accounts,
@@ -15,7 +14,6 @@ export function SiteHeader({
   return (
     <Header
       logo={<AppLogo />}
-      navigation={<SiteNavigation />}
       actions={<SiteHeaderAccountSection accounts={accounts} />}
     />
   );