I've placed the `application` and `data` directories into a `volumes`
subdirectory. The top level `data` directory is now used for storing the
data used by the database (and other, if any) containers. The `data`
directory has also been added to the `.gitignore` file to prevent
accidental pushing of user data.
- upgrade docker compose to v2
- build images locally instead of pulling them from the registry
- separate php container form nginx container
- support all the php versions including php 7.0
- remove beanstalked container to be optionally added later by the user
