Remove lingering async-graphql example file

It should have been deleted previously

examples/async-graphql/src/main.rs

@@ -1,47 +0,0 @@
-//! Example async-graphql application.
-//!
-//! Run with
-//!
-//! ```not_rust
-//! cd examples && cargo run -p example-async-graphql
-//! ```
-
-mod starwars;
-
-use async_graphql::{
-    http::{playground_source, GraphQLPlaygroundConfig},
-    EmptyMutation, EmptySubscription, Request, Response, Schema,
-};
-use axum::{
-    extract::State,
-    response::{Html, IntoResponse},
-    routing::get,
-    Json, Router,
-};
-use starwars::{QueryRoot, StarWars, StarWarsSchema};
-
-async fn graphql_handler(schema: State<StarWarsSchema>, req: Json<Request>) -> Json<Response> {
-    schema.execute(req.0).await.into()
-}
-
-async fn graphql_playground() -> impl IntoResponse {
-    Html(playground_source(GraphQLPlaygroundConfig::new("/")))
-}
-
-#[tokio::main]
-async fn main() {
-    let schema = Schema::build(QueryRoot, EmptyMutation, EmptySubscription)
-        .data(StarWars::new())
-        .finish();
-
-    let app = Router::new()
-        .route("/", get(graphql_playground).post(graphql_handler))
-        .with_state(schema);
-
-    println!("Playground: http://localhost:3000");
-
-    axum::Server::bind(&"0.0.0.0:3000".parse().unwrap())
-        .serve(app.into_make_service())
-        .await
-        .unwrap();
-}