I wonder how didn't I notice that. Anyways, I ran the port offline, hacked into the Bitmap Fonts plugin like this, enabled it and moved the JSON files from the fonts/Bitmap Fonts/GameFont folder to the data folder and the game loaded the bitmap font fine, so you could try doing that.
Also, you should probably add a note about the offline index.html not being able to load files from the file system unless Chrome was launched with a specific flag or unless a local web server was set up. (At least it wasn't able to for me.)