Still cleaning things up

And justifying the existence of a file. The goal of all my work the past day or so is to make what documentation DOES exist in the repo a little bit useful, and to get out of sight the ones that will lead you down the wrong rabbit hole. There's plenty of good stuff that's been deleted that could help with a partial understanding of Urbit, but a fragmented one. Those who want to explore that can dig in to past commits.

Along that vein it might be worth tagging a commit before 9/26, for before a lot of other hands started jumping in?