Move ecosystem under create
Currently, the Ecosystem team async retrospectives can be found in gl-retrospectives/ecosystem/. Being part of the Create stage, I propose moving them to gl-retrospectives/create-stage/ecosystem/. The other teams in Create are all under that create-stage group.
@dsatcher already created the Ecosystem project. But I am looking for feedback on if we want to use it or not. I made this MR in an MR-first attempt to start the discussion.