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/cart/use-remove-item.tsx

@@ -0,0 +1,48 @@
+import { useCallback } from 'react'
+import { HookFetcherContext, MutationHookContext } from '@commerce/utils/types'
+import useRemoveItem, { UseRemoveItem } from '@commerce/cart/use-remove-item'
+import { CommerceError } from '@commerce/utils/errors'
+import useCart from './use-cart'
+import {
+  RemoveOrderLineMutation,
+  RemoveOrderLineMutationVariables,
+} from '../schema'
+import { Cart, LineItem, RemoveCartItemBody } from '@commerce/types'
+import { normalizeCart } from '../lib/normalize'
+import { removeOrderLineMutation } from '../lib/mutations/remove-order-line-mutation'
+
+export default useRemoveItem as UseRemoveItem<typeof handler>
+
+export const handler = {
+  fetchOptions: {
+    query: removeOrderLineMutation,
+  },
+  async fetcher({ input, options, fetch }: HookFetcherContext<LineItem>) {
+    const variables: RemoveOrderLineMutationVariables = {
+      orderLineId: input.id,
+    }
+    const { removeOrderLine } = await fetch<RemoveOrderLineMutation>({
+      ...options,
+      variables,
+    })
+
+    if (removeOrderLine.__typename === 'Order') {
+      return normalizeCart(removeOrderLine)
+    }
+    throw new CommerceError(removeOrderLine)
+  },
+  useHook: ({
+    fetch,
+  }: MutationHookContext<Cart | null, RemoveCartItemBody>) => (ctx = {}) => {
+    const { mutate } = useCart()
+
+    return useCallback(
+      async function removeItem(input) {
+        const data = await fetch({ input })
+        await mutate(data, false)
+        return data
+      },
+      [fetch, mutate]
+    )
+  },
+}