Stop using host network to build containers since newer version of Docker fail without --allow.

Config/HugoExample/docker-compose.example.yml

@@ -6,7 +6,6 @@ services:
     container_name: hugo
     build:
       context: ./
-      network: host
     restart: always
     ports:
       - 8013:80   # Production minified files served using NGINX.