Merge remote branch 'elliot/cookbook-consistency'

* elliot/cookbook-consistency:
  cookbook: Fixed typo
  cookbook: Fix build so CSS files get installed
  cookbook: Moved paragraph where it logically belongs
  cookbook: Added some judicious note elements
  cookbook: Added more information for contributors
  cookbook: Link out to docbook site
  cookbook: Made docbook element usage consistent
  cookbook: Additional selectors in CSS stylesheet
  cookbook: Copy the CSS file into the HTML build directory