Update admin and marketing layouts, add new admin components

Refined both admin and marketing layouts for a clearer design. Newly added components for the admin page include admin-account-page, admin-members-table and admin-memberships-table. Also included in this update are route renaming, minor text edits and corrections in the code.

apps/web/app/admin/layout.tsx

@@ -2,6 +2,10 @@ import { Page } from '@kit/ui/page';
 
 import { AdminSidebar } from '~/admin/_components/admin-sidebar';
 
+export const metadata = {
+  title: `Admin`,
+};
+
 export default function AdminLayout(props: React.PropsWithChildren) {
   return <Page sidebar={<AdminSidebar />}>{props.children}</Page>;
 }