Start the guide
Add mention to CoffeeScript syntax highlighter
Add key binding to reveal the current file in the sidebar
Advocate placing new settings in Settings-User instead of Settings-Default

In Settings-Default, they are overriden each time Sublime Text is updated.
Not everything needs to be a header
Add indentation section

Use formatting according to:

* https://github.com/bbatsov/ruby-style-guide#source-code-layout
* https://github.com/thoughtbot/guides/tree/master/style#formatting
Add unsaved tabs highlight