Improve deployments index page

Summary

  • Show successful deployments
  • Show failed deployments
  • Show canceled deployments
  • Show start action (i.e. environments: action: start)
  • Show stop action (i.e. environments: action: stop)

Here is how it looks today

Screenshot_from_2018-11-05_19-01-38

/cc @dimitrieh @jlenny

Edited by 🤖 GitLab Bot 🤖