deck.js, toastr.js, refactor, remove GA in dev

Add in deck.js as an experiment to see how walkthroughs would look like
as a slideshow.  Looks promising.

Add in toastr.js to display "not complete yet" toast message on Trails
in the Sky SC microsite.

Refactored templating of walkthroughs.  Also fixed an orphan p tag in
chapter 1 (really screws up the slideshow)

Don't render the google analytics JS if on midoshiro.info (local dev).
GA is set to filter out my IP but one can't be too paranoid ...