Handle legacy content and empty pages (#40)

* remove outdated libraries

* rename reference to appendix

* write how to document an addon

* change wording for sass

* fix reference --> appendix links

* fix link

* clean up the existing content

* move asset compilation into the advanced section

* remove redundant content from dependencies

* remove bower from the stylesheets

* move files around

* more cleanup, comment out unused pages

* rename tutorial to intro-tutorial

0.1.0

fix spelling

0.0.3

0.0.2

0.0.1