DEP 0019: Technical Governance for Django

Now accepted, DEP 19 supersedes DEP 10 and DEP 12 as Django's single technical governance document, and trades hard eligibility rules for eight qualitative traits that Steering Council candidates should show three or more of. The five-member council keeps binding authority over technical decisions, with elections triggered by the final feature release of a major release series, a drop below three elected members, or a council vote.