fixes #1672 remove dead left class

The class left was used in the jazz hands and in our gobal css to do different things.

In firefox the jazzhands picked up on the global left class.

I looked up and down for where the left class is used, and I could not find it.

I found one spot in the landing page, but it had it's own left class declared in site.less, so, that wasn't it. I think it's a dead class and we should just remove it.