remove references to Dev Environments feature

Signed-off-by: Guillaume Lours <705411+glours@users.noreply.github.com>

nginx-aspnet-mysql/.docker/docker-compose.yaml

@@ -1,38 +0,0 @@
-services:
-  backend:
-    build:
-      context: backend
-      target: dev-envs
-    restart: always
-    secrets:
-      - db-password
-    depends_on: ['db']
-    environment:
-      - ASPNETCORE_URLS=http://+:8000
-    volumes:
-      - /var/run/docker.sock:/var/run/docker.sock
-
-  db:
-    image: mariadb:10-focal
-    command: '--default-authentication-plugin=mysql_native_password'
-    restart: always
-    secrets:
-      - db-password
-    volumes:
-      - db-data:/var/lib/mysql
-    environment:
-      - MYSQL_DATABASE=example
-      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db-password
-
-  proxy:
-    build: proxy
-    ports:
-      - 80:80
-    depends_on: 
-      - backend
-
-volumes:
-  db-data:
-secrets:
-  db-password:
-    file: db/password.txt

nginx-aspnet-mysql/README.md

@@ -1,12 +1,5 @@
 ## Compose sample application
-
-### Use with Docker Development Environments
-
-You can open this sample in the Dev Environments feature of Docker Desktop version 4.12 or later.
-
-[Open in Docker Dev Environments <img src="../open_in_new.svg" alt="Open in Docker Dev Environments" align="top"/>](https://open.docker.com/dashboard/dev-envs?url=https://github.com/docker/awesome-compose/tree/master/nginx-aspnet-mysql)
-
-### ASP.NET server with an Nginx proxy and a MySQL database
+### ASP.NET server with a Nginx proxy and a MySQL database
 
 Project structure:
 ```