Removed FAQ

I removed the FAQ.

We agreed that we wouldn't introduce a transaction fee and would keep
the service free for the time being. We'll worry about monetization
once we get users.

And the other information is either redundant or not all that
necessary. (Do we really need to explain what bitcoin is?)

I guess the point of a FAQ section is to eliminate any confusion on how
the service works, but that should best be done in the "how does it
work" section of the page. We can always add a FAQ section later if
needed, but if so, I don't think it should be one the front page.