Fix broken links to Docker-CommunityServer (#402)

Continue of #400

Those links became incorrect in
e7c8e59a37

I'm not sure that we REALLY need those links in this project, maybe just
give links to README page and that's it
But leaving it as it is

README.md

@@ -245,7 +245,7 @@ sudo docker run --init --net onlyoffice --privileged -i -t -d --restart=always -
  onlyoffice/mailserver
 ```
 
-The additional parameters for mail server are available [here](https://github.com/ONLYOFFICE/Docker-CommunityServer/blob/master/docker-compose.yml#L75).
+The additional parameters for mail server are available [here](https://github.com/ONLYOFFICE/Docker-CommunityServer/blob/master/docker-compose.workspace_enterprise.yml#L87).
 
 To learn more, refer to the [ONLYOFFICE Mail Server documentation](https://github.com/ONLYOFFICE/Docker-MailServer "ONLYOFFICE Mail Server documentation").
 
@@ -295,7 +295,7 @@ bash opensource-install.sh -md yourdomain.com
 Or, use [docker-compose](https://docs.docker.com/compose/install "docker-compose"). For the mail server correct work you need to specify its hostname 'yourdomain.com'. Assuming you have docker-compose installed, execute the following command:
 
 ```bash
-wget https://raw.githubusercontent.com/ONLYOFFICE/Docker-CommunityServer/master/docker-compose.yml
+wget https://raw.githubusercontent.com/ONLYOFFICE/Docker-CommunityServer/master/docker-compose.groups.yml
 docker-compose up -d
 ```