start taking a crack at more fine-grained documentation.
regroup, add more sections
first mention of update subcommand
start sections for release-init
yank portability note out of main readme and into doc page on the subject
note about windows installing, and java runtime download links
moving the release repo sketch into its own doc page
start docs on how linking works and where data storage is
start elucidating the split between working tree and git objects right from the first paragraph about data location.
start talking about release repo hosting.  basically, reiterating that It's Just Git.

later this page will break down more and also talk about mdm-specific helper tools, but we'll defer that until those are more release-ready.
split out subsection of ssh q&a to specifically address config parsing.
minor phrasing
move all the directions on building from source out of the main readme and into their own document.
voice
Merge branch 'doc'