[marketing] Need to split section 8

[ccchwang]

I misinterpreted Billy's designs for section 8, "History Keeps Track of the Actions".

Currently, a green checkmark animates on the graphic when you scroll into the section.

Instead, section 8 should be split into two: 8-1 and 8-2. When you scroll from 8-1 to 8-2, the text will change, but the graphic will remain the same. The only difference is that the green checkmark will animate on 8-2.

Let me know if this doesn't make sense.