Added draft for central postgres and mariadb. variables and networks still need to be adapted

roles/docker-wordpress/templates/docker-compose.yml.j2

@@ -15,17 +15,19 @@ services:
       WORDPRESS_DB_USER:      "{{database_username}}"
       WORDPRESS_DB_PASSWORD:  "{{database_password}}"
       WORDPRESS_DB_NAME:      "{{database_databasename}}"
-    links:
-      - database
     volumes:
       - data:/var/www/html
+{% if not ( enable_central_database | lower | bool )  %}    
     depends_on:
       - database
 
 {% include 'templates/docker-mariadb-service.yml.j2' %}
+{% endif %}
 
 volumes:
+{% if not ( enable_central_database | lower | bool )  %}
   database:
+{% endif %}
   data:
 networks:
   default: