Blog skeleton is not a subproject as implied.

- Moved directory information to the blog skeleton section.
- Removed reference to going back to your Sculpin project before
  downloading the blog skeleton. That was bad information.
- Fixed white space issues.
Distinguish between Sculpin and starter kit

- Added a new section for the starter kit installation.
- Removed the reference to composer as this is confusing for the
  getting started guide.
- Updated references from "skeleton" to "starter kit".
Remove reference to running install as root.
Merge pull request #35 from emmajane/master

Blog skeleton is not a subproject as implied.