Remove old mailing lists

I don’t think we should keep the existing mailing lists for too long in parallel with the new Discourse. Otherwise we’ll keep the two systems, and have a mess with the discussions.

My proposal is:

  • Announce Discourse via twitter and the pydata mailing list
  • Leave couple of weeks to see the there is no unexpected issue with Discourse
  • On the 25th of November, delete the previous mailing lists (pandas-dev, and the core team google group), and keep just Discourse

I guess the pydata google group has a broader scope than pandas, and should be left as is for now.

Any objection?