Make it more intuitive for new user to buy LBC publications.

[JYamihud]

I have put a video out for sale with LBC coins and it's mostly intended for people outside of the platform. There was a different issue that was already fixed but I see a few more problems that could be improved.

1. When people are coming to the page they see the LBC price with the LBC logo and a big Purchase button. They assume that the price is in Dollars ( many complained to me about the price ) . Most of them do not know what LBC is. And therefor the logo doesn't help them. Maybe you can write somewhere the price in Dollars as well for clarity.

2. People wanting to buy LBC get a message that the service is currently unavailable without an alternative of any sorts. Maybe you can link to https://lbry.com/faq/exchanges or something. Or make the "Buy LBC" button go the LBRY faq or something.