[doc] TOOLS-623 readme copyedit. - Removed mention of "usage" to remove confusion. - Prose repo name. - Add “License" section. - rm Repository/"Code Layout" section. - Updated "repo is part of" template. - Sub-headings markdown.
[doc] TOOLS-623 readme copyedit.
- Removed mention of "usage" to remove confusion.
- Prose repo name.
- Add “License" section.
- rm Repository/"Code Layout" section.
- Updated "repo is part of" template.
- Sub-headings markdown.

joyent/sdc-heartbeater-agent,joyent/sdc-heartbeater-agent