remove references to Dev Environments feature

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

nginx-flask-mongo/.docker/docker-compose.yaml

@@ -1,27 +0,0 @@
-services:
-  web:
-    image: nginx
-    volumes:
-      - ./nginx/nginx.conf:/tmp/nginx.conf
-    environment: 
-      - FLASK_SERVER_ADDR=backend:9091  
-    command: /bin/bash -c "envsubst < /tmp/nginx.conf > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'" 
-    ports:
-      - 80:80
-    depends_on:
-      - backend
-
-  backend:
-    build:
-      context: flask
-      target: dev-envs
-    stop_signal: SIGINT
-    environment:
-      - FLASK_SERVER_PORT=9091
-    volumes:
-      - /var/run/docker.sock:/var/run/docker.sock
-    depends_on:
-      -  mongo  
-
-  mongo:
-    image: mongo

nginx-flask-mongo/README.md

@@ -1,11 +1,4 @@
 ## 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-flask-mongo)
-
 ### Python/Flask application with Nginx proxy and a Mongo database
 
 Project structure: