Introduction isn't simple enough about deck.js

[imakewebthings]

@ChrisJefferson No need to be embarrassed, I think you're right on this. Currently the introduction deck included in the download and the introduction deck on the project page are the same, not only in content but in function. Both let you play with the themes to see what they look like. But the introduction deck in the download is overwhelmingly used bas a skeleton. The theme selectors don't need to be there. If people want to play with the themes they can go to the project page, or swap the CSS out at the top (which they will need to do anyway).

It should be noted that /core/deck.core.html contains a true stripped down skeleton to work with, but I think removing the theme selectors from the master intro deck would be a good thing.