I'm having the same problem. The docker link is dead, and git repo link points to "git.com". The documentation needs a thorough review. There is no documentation on how to embed Activiti Explorer in an existing application either.
Sorry about this guys - we're keen to help improve this experience. The files to use for docker are yml files in the docker directory of activiti-cloud-examples. I recommend going to the 'develop' branch. (Perhaps you're using master?) If you hit issues then personally I'd suggest starting by trying to do docker-compose -f <FILE> -up and doing this in separate windows so you can see the logs for each. You should be able to interact with the example app using the postman collection in the json file at the base level of the repo.
Activiti 7 is getting a lot of development focus so the dev and master versions can get of sync quickly. You can catch the Activiti 7 dev team on gitter. For these types of questions it would be great to get the faster feedback of gitter.
Thanks a lot for the response! I’m trying to build 6.x branch from Activiti github repo. It can’t find a dependency (Could not find artifact org.apache.geronimo.specs:specsom:1.1 in central) but once that gets resolved, I might be ok.