Fix docker-compose syntax error

[dagisus]

the docker-compose had multiple syntax and indentation errors, it was missing the version and services block and part of the mautic service parameters where indented with tabs, also the database link had an unnecessary name tag and the database host env var was referring to localhost instead of the DB service linked to it. Also there is a volume linked to a data folder that doesn't apply to most cases and is not referred to in this readme, if a "plug and play" installation is intended, is best to use the data folder in the image and explain, if data persistence is needed, then other configs must be performed.

[aspiers]

Thanks @dagisus. I already dealt with some of these issues in #111. Perhaps you could rebase yours on top of mine to avoid duplication?

[iurisilvio]

environment is an array, it must be:

- MYSQL_ROOT_PASSWORD=mysecret

[luizeof]

@dagisus

Hello, how are you? sorry for the delay. Due to the moves between Mautic / Aquia there was some delay in communication between the mautic team and me about the permissions on the dockerhub and github repository.

Now the problem is solved and I will come back with the pulls and issues.

Could you please update your pull with the latest version of the master? just to avoid merge problems.

Thank you!