reorganize a bunch of files and content
add guidance level for 'how-to' section
Merge branch 'userguide' of github.com:databrary/www into userguide

Conflicts:
	databrary/input/pages/user-guide.md
	databrary/input/pages/user-guide/responsibilities/investigators.md
Merge branch 'userguide' of github.com:databrary/www into userguide