Remove homecards page (#7083)

I'm removing the homecards page because the Setup Guide team for Home is going to be sunsetting use of cards in favour of more strategic, guiding, and customized onboarding guidance for merchants. We are helping them contribute their guides pattern to the site.

Author: selenehinkley

polaris.shopify.com/content/foundations/patterns/home-cards/index.md

@@ -220,13 +220,6 @@ export const foundationsNavItems: NavItemWithIcon[] = [
         description:
           'Polaris provides many layout patterns that help you create efficient and familiar interfaces.',
       },
-      {
-        title: 'Home cards',
-        url: '/foundations/patterns/home-cards',
-        icon: 'TextBlockMajor',
-        description:
-          'Home cards make actionable recommendations based on data from the merchant’s store, or give merchants feedback about their store’s performance.',
-      },
       {
         title: 'Error messages',
         url: '/foundations/patterns/error-messages',