Forex page

We should have the story of what forex looks like done before we implement all of the details.

I'd like to work on this PR so that we can have our main marketing page ready for when forex ships.

@dmdj03 and @kyungmin , let's talk about how this page should look.

@jkwade, I'm not sure what the best info to actually put on this page is. I'm working on drafting it up, but would appreciate your input here.