using bind mount for aktin.properties (suggestion)

Hello everyone,

currently, the configuration file is written to a docker volume and must be edited via sudo or root in the directory ‘/var/lib/docker/volumes’.

I would like to suggest using this as a so-called ‘bind mount’ from the directory of the docker compose configuration.
https://docs.docker.com/engine/storage/bind-mounts/

In conjunction with the suggestion to use individual directories for the respective docker-compose.yml, it could look like this:

```
wildfly:
image: ghcr.io/aktin/notaufnahme-dwh-wildfly:1.6rc1-2-docker2
hostname: wildfly
restart: unless-stopped
environment:
DB_HOST: database
DB_PORT: 5432
volumes:
# - aktin_config:/etc/aktin
- ./aktin.properties:/opt/wildfly/standalone/configuration/aktin.properties
- aktin_data:/var/lib/aktin
```

In conjunction with the directory structure mentioned in Issue #7, it could work like this:

```
-> /opt/docker-deploy/
-> /aktin-dwh1
- docker-compose.yml
- aktin.properties
```

Best regards