changing to .env so we can use FQDN to config docker-compose.*.yml

[hpwjnijs]

To change your FQDN we can use .env for

• environment variables
• AND configuring the docker-compose.*.yml 's itself
• adressing Migrate away from georchestra-127-0-1-1.traefik.me in the traefik docker compose file #219

(N.B. Split up from #278)

[edevosc2c]

Hello Nijs, Thank you for the PR.

But if you do that, there won't be any domain set by default. That's not what we want. We don't want to force the user to configure a domain.

[hpwjnijs]

Hi,
Because of the .gitignore my .env was not committed. It is the renamed .envs-common. Added just now.