Creates shadow_directory cookbook and uses

to sync downloads to inbox
removes old notes
Removes a bunch of useless garbage

Much of these notes were designed to document the entire setup process
of the repository, but that is not useful anymore -- this document is no
longer a tutorial, it is a literate description of the system setup.
remaining changes to dotfiles.org

basically this is a huge commit. I couldnt figure out how to make git
make these diffs smaller, so this is as good as I could get.
remaining tangled files
removes 'create-inbox-directory' script

This functionality now comes from the 'shadow directory' cookbook