Vendure provider (#223)

* Minimal list/detail views working with Vendure

* Implement useCart/useAddItem

* Implement useUpdateItem & useRemoveItem

* Implement useSearch

* Add operations codegen, tidy up

* Dummy checkout page

* Implement auth/customer hooks

* Use env var for Shop API url

* Add some documentation

* Improve error handling

* Optimize preview image size

* Fix accidental change

* Update Vendure provider to latest changes

* Vendure provider: split out gql operations, remove unused files

* Update Vendure provider readme

* Add local next.config to Vendure provider, update docs

* Update to use demo server

* Fix build errors

* Use proxy for vendure api

* Simplify instructions in Vendure readme

* Refactor Vendure checkout api handler

* Improve image quality

framework/vendure/customer/get-customer-wishlist.ts

@@ -0,0 +1,18 @@
+import { getConfig, VendureConfig } from '../api'
+
+async function getCustomerWishlist({
+  config,
+  variables,
+  includeProducts,
+}: {
+  url?: string
+  variables: any
+  config?: VendureConfig
+  includeProducts?: boolean
+}): Promise<any> {
+  // Not implemented as Vendure does not ship with wishlist functionality at present
+  config = getConfig(config)
+  return { wishlist: {} }
+}
+
+export default getCustomerWishlist