Fix docker-compose recipes

There is a bit of duplicated, outdated code in-and-around docker-compose files. Things to improve:
- [ ] use `.env` file instead of `env.rc` for `docker-compose` seamless use
- [ ] use docker-compose recipes inheritance mechanism (`docker-compose.yml` -> `docker-compose.awstats.yml` -> `docker-compose.full.yml`)
- [ ] move docker-compose build instructions to `docker-compose.yml`