remove dead links, add new videos.

Author: gmac

01-combining-local-and-remote-schemas/README.md

@@ -17,7 +17,7 @@ This example explores basic techniques for combining local and remote schemas to
 ## Setup
 
 ```shell
-cd 01-combining-local-and-remote-schemas
+cd combining-local-and-remote-schemas
 
 yarn install
 yarn start-services

02-single-record-type-merging/README.md

@@ -11,7 +11,7 @@ This example explores stitching mutation and subscription services into a combin
 ## Setup
 
 ```shell
-cd 05-mutations-and-subscriptions
+cd mutations-and-subscriptions
 
 yarn install
 yarn start-services

03-array-batched-type-merging/README.md

@@ -1,5 +1,9 @@
 # Chapter 9 – Stitching directives SDL
 
+**Watch the [Chapter 9 Video](https://www.youtube.com/watch?v=dE9cJsxOLeQ)**
+
+[![Stitching Directives SDL](../images/video-player.png)](https://www.youtube.com/watch?v=dE9cJsxOLeQ)
+
 This example demonstrates the use of stitching directives to configure type merging via subschema SDLs. Shifting this configuration out of the gateway makes subschemas autonomous, and allows them to push their own configuration up to the gateway—enabling more sophisticated schema releases.
 
 The `@graphql-tools/stitching-directives` package provides importable directives that can be used to annotate types and fields within subschemas, a validator to ensure the directives are used appropriately, and a configuration transformer that can be used on the gateway to convert the subschema directives into explicit configuration setting.

combining-local-and-remote-schemas/README.md

@@ -1,5 +1,9 @@
 # Chapter 5 – Cross-service interfaces
 
+**Watch the [Chapter 5 Video](https://www.youtube.com/watch?v=wPB5oI_Tjik)**
+
+[![Cross-service interfaces](../images/video-player.png)](https://www.youtube.com/watch?v=wPB5oI_Tjik)
+
 This example explores setting up a GraphQL interface that spans across service boundaries, as described in the [merged interfaces documentation](https://www.graphql-tools.com/docs/stitch-type-merging#merged-interfaces). This is an extremely powerful feature made possible by the flexibility of type merging, yet it's easy to overlook.
 
 **This example demonstrates:**
@@ -9,7 +13,7 @@ This example explores setting up a GraphQL interface that spans across service b
 ## Setup
 
 ```shell
-cd 04-cross-service-interfaces
+cd cross-service-interfaces
 
 yarn install
 yarn start-gateway

mutations-and-subscriptions/README.md

@@ -34,7 +34,10 @@ const productDeals = [
 // graphql resolvers
 const resolvers = {
   Query: {
-    storefront: (root, { id }) => storefronts.find(s => s.id === id) || new NotFoundError(),
+    storefront: (root, { id }, _, info) => {
+      console.log(require('graphql').print(info.operation));
+      return storefronts.find(s => s.id === id) || new NotFoundError()
+    },
   },
   Storefront: {
     products(storefront) {