fix issues with acme volume

when directly voluming in the json and it does not exist, docker automatically creates a directory to mount which traefik chokes on trying to access it as a file. create a sensible mount dir but configure traefik to make a file in that directory (next commit)

deployment/examples/docker-compose.yaml

@@ -103,7 +103,7 @@ services:
       - /var/run/docker.sock:/var/run/docker.sock
       - ./config/traefik.toml:/traefik.toml
       - ./config/usersfile:/usersfile
-      - ./data/acme.json:/acme.json
+      - ./config/acme:/acme
 
     networks:
       - gateway