This is so cool! Is your site open sourced ?
homepage.js is the translated Ink script after processing by inkjs (from Inkle)
ink.js is a bunch of Inkle magic
main.js has some custom choice behavior I wrote for things like opening browser tabs when you pick certain choices, as well as some other stuff.
I actually didn't commit the original Ink script to version control, and I'm kicking myself for that now.