Clearer step-wise UI workflow for setting up a new topic

[ragesoss]

For the Management Actions component, for initial setup of a new topic, the UI should clearly direct the user through each of the necessary steps of adding articles, adding users, and generating the data. At least for a topic that hasn't yet gone through all three steps, I think it should only show one of these at a time, at the top of the Management Actions, so that it's very clear what they should do next to move forward.

I also think we ought to automatically import users and articles at the time of CSV upload, combing upload and import into a single action.

The current UI is okay for after timepoint generation has been kicked off.

[ragesoss]

@mattfordham if you can squeeze this in before Wikimania (first week of August) that would be ideal.

[mattfordham]

@ragesoss How would you prioritize against the new server setup?

[ragesoss]

@mattfordham after.