Remove version from compose files to conform to the specification

https://github.com/compose-spec/compose-spec/blob/master/spec.md#version-top-level-element



Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

angular/README.md

@@ -14,7 +14,6 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
-version: "3.7"
 services:
   web:
     build: angular

angular/docker-compose.yaml

-version: "3.7"
 services:
   web:
     build: angular

apache-php/docker-compose.yaml

-version: "3.7"
 services:
   web:
     build: app

aspnet-mssql/docker-compose.yaml

-version: "3.7"
 services:
   web:
     build: app/aspnetapp

django/docker-compose.yml

-version: '3.7' 
-services: 
+services:
   web: 
     build: app 
     ports: 

elasticsearch-logstash-kibana/docker-compose.yml

-version: '3.8'
-
 services:
   elasticsearch:
     image: elasticsearch:7.8.0

flask/docker-compose.yaml

-version: '3' 
-services: 
+services:
   web: 
     build: app 
     ports: 

gitea-postgres/docker-compose.yaml

-version: '3.7'
 services:
   gitea:
     image: gitea/gitea:latest

minecraft/docker-compose.yml

-version: '3.7'
 services:
  minecraft:
    image: itzg/minecraft-server

nextcloud-postgres/docker-compose.yaml

-version: '3.7'
 services:
   nc:
     image: nextcloud:apache

nextcloud-redis-mariadb/docker-compose.yaml

-version: '3.7'
 services:
   nc:
     image: nextcloud:apache

nginx-aspnet-mysql/docker-compose.yaml

-version: "3.7"
 services:
   backend:
     build: backend

nginx-flask-mongo/docker-compose.yaml

-version: "3.7"
 services:
   web:
     image: nginx

nginx-flask-mysql/docker-compose.yaml

-version: "3.7"
 services:
   db:
     image: mysql:8.0.19

nginx-golang-mysql/docker-compose.yaml

-version: "3.7"
 services:
   backend:
     build: backend

nginx-golang-postgres/docker-compose.yaml

-version: "3.7"
 services:
   backend:
     build: backend

nginx-golang/README.md

@@ -16,7 +16,6 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
-version: "3.7"
 services:
   frontend:
     build: frontend

nginx-golang/docker-compose.yml

-version: "3.7"
 services:
   frontend:
     build: frontend

nginx-wsgi-flask/docker-compose.yaml

-version: "3.7"
 services:
   nginx-proxy:
     build: nginx

prometheus-grafana/README.md

@@ -14,7 +14,6 @@ Project structure:
 
 [_docker-compose.yml_](docker-compose.yml)
 ```
-version: "3.7"
 services:
   prometheus:
     image: prom/prometheus