remove references to Dev Environments feature

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

flask-redis/.docker/docker-compose.yaml

@@ -1,16 +0,0 @@
-services:
-  redis:
-    image: redislabs/redismod
-    ports:
-      - '6379:6379'
-  web:
-    build:
-      context: .
-      target: dev-envs
-    stop_signal: SIGINT
-    ports:
-      - '8000:8000'
-    volumes:
-      - /var/run/docker.sock:/var/run/docker.sock
-    depends_on:
-      - redis

flask-redis/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/flask-redis)
-
 ### Python/Flask application using a Redis database
 
 Project structure: