refactor(theme): disable @vue-storefront/core $vsf context plugin

see vuestorefront/vue-storefront#6641
the abillity to do this is new in @vue-storefront/[email protected]
(version bump made earlier today)

suqsh this

Author: sethidden

packages/theme/nuxt.config.js

@@ -83,6 +83,8 @@ export default () => {
             '@vue-storefront/core',
           ],
         },
+        // selectively disabling certain @vue-storefront/core plugins for migration
+        context: false,
       }],
       ['@vue-storefront/magento/nuxt', {
         i18n: {