docs: cleanup fed example docs (ExpediaGroup#1629)

Remove old docs from README.

Author: dariuszkuc

examples/federation/README.md

@@ -46,84 +46,3 @@ query ExampleQuery {
     }
 }
 ```
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-is two Spring applications `base-app` and `extend-app` that use `graphql-kotlin-federation` to generate the schema.
-These apps run on different ports (`8080`, `8081`) so they can run simultaneously.
-
-The `gateway` is a Node.js app running Apollo Gateway on port `4000` and connects to the two Spring apps.
-You can make queries against the Spring apps directly or run combined queries from the gateway.
-
-## Running Locally
-
-
-### Spring Apps
-Build the Spring applications by running the following commands in the `/federation` directory
-
-```shell script
-./gradlew clean build
-```
-
-> NOTE: in order to ensure you use the right version of Gradle we highly recommend to use the provided wrapper scripts
-
-Start the servers:
-
-* Run each `Application.kt` directly from your IDE
-* Alternatively you can also use the spring boot plugin from the command line.
-
-```shell script
-./gradlew bootRun
-```
-
-
-Once the app has started you can explore the example schema by opening the Playground endpoint
-* `base-app` http://localhost:8080/playground
-* `extend-app` http://localhost:8081/playground
-
-### Gateway
-
-See the instructions in the gateway [README](./gateway/README.md)
-
-
-
-1. Start `products-subgraph` by running the Spring Boot app from the IDE or by running `./gradlew bootRun` from `products-subgraph` project
-2. Start `reviews-subgraph` by running the Spring Boot app from the IDE or `./gradlew bootRun` from `reviews-subgraph` project
-3. Start Federated Router
-    1. Install [rover CLI](https://www.apollographql.com/docs/rover/getting-started)
-    2. Start router and compose products schema using [rover dev command](https://www.apollographql.com/docs/rover/commands/dev)
-
-    ```shell
-    # start up router and compose products schema
-    rover dev --name products --schema ./products-subgraph/src/main/resources/graphql/schema.graphqls --url http://localhost:8080/graphql
-    ```
-
-    3. In **another** shell run `rover dev` to compose reviews schema
-
-    ```shell
-    rover dev --name reviews --schema ./reviews-subgraph/src/main/resources/graphql/schema.graphqls --url http://localhost:8080/graphql
-    ```
-
-4. Open http://localhost:3000 for the query editor
-
-Example federated query
-
-```graphql
-query ExampleQuery {
-    products {
-        id
-        name
-        description
-        reviews {
-            id
-            text
-            starRating
-        }
-    }
-}
-```