FLUID-5516: Updated build site to match new design.

@jobara @acheetham - I've updated the build site to match the new designs. Can you check to make sure I got all the right demos and that the links all go to the right places?
Ah, I misunderstood initially. This seems to me to be a bug with UIO not having the correct border and no-shadow when in a contrast mode.

I'll fix this for the website, but we should really fix it in UIO.