Fix link formatting.
Excise Haml from within files.
Touch up the FAQ.
[Haml] Fix the FAQ not to refer to init.rb anymore.
[Haml] Allow multiline Ruby blocks.
[Sass] Update docs about defining custom functions.
Add the form_for issue to the FAQ.
Add tables of contents to the references and FAQ.
Move the Haml and Sass references into their own files.
Add a doc-src directory for documentation files.