Update 2013-12-10-vim-as-a-design-tool.md

Very minor changes in this diff that you should feel free to ignore, but I'll use this to comment on the post in general.

This feels like a good intro, but I think it could use two things:

* Explicitly state that you are designing in the browser.  If someone is designing in photoshop, this is one step beyond where they are—they first need to decide to stop designing in photoshop and you can send them to some articles about that.
* An example  (or two) early on.  The "list of questions" at the end is nice and concrete, but when you are talking about the concept of commands, you could probably stop and show a block of code, state a common change you'd like to make and explain how that change can be made really simply if you know how to use your editor.