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/lib/normalize.ts

@@ -0,0 +1,55 @@
+import { Cart, Product } from '@commerce/types'
+import { CartFragment, SearchResultFragment } from '../schema'
+
+export function normalizeSearchResult(item: SearchResultFragment): Product {
+  return {
+    id: item.productId,
+    name: item.productName,
+    description: item.description,
+    slug: item.slug,
+    path: item.slug,
+    images: [{ url: item.productAsset?.preview + '?w=800&mode=crop' || '' }],
+    variants: [],
+    price: {
+      value: (item.priceWithTax as any).min / 100,
+      currencyCode: item.currencyCode,
+    },
+    options: [],
+    sku: item.sku,
+  }
+}
+
+export function normalizeCart(order: CartFragment): Cart {
+  return {
+    id: order.id.toString(),
+    createdAt: order.createdAt,
+    taxesIncluded: true,
+    lineItemsSubtotalPrice: order.subTotalWithTax / 100,
+    currency: { code: order.currencyCode },
+    subtotalPrice: order.subTotalWithTax / 100,
+    totalPrice: order.totalWithTax / 100,
+    customerId: order.customer?.id,
+    lineItems: order.lines?.map((l) => ({
+      id: l.id,
+      name: l.productVariant.name,
+      quantity: l.quantity,
+      url: l.productVariant.product.slug,
+      variantId: l.productVariant.id,
+      productId: l.productVariant.productId,
+      images: [{ url: l.featuredAsset?.preview + '?preset=thumb' || '' }],
+      discounts: l.discounts.map((d) => ({ value: d.amount / 100 })),
+      path: '',
+      variant: {
+        id: l.productVariant.id,
+        name: l.productVariant.name,
+        sku: l.productVariant.sku,
+        price: l.discountedLinePriceWithTax / 100,
+        listPrice: l.linePriceWithTax / 100,
+        image: {
+          url: l.featuredAsset?.preview + '?preset=thumb' || '',
+        },
+        requiresShipping: true,
+      },
+    })),
+  }
+}