free account links need to be edited

[phila82r]

All links sending users to https://app.dfuse.io to create a free account should be edited to https://www.dfuse.io/pricing instead of https://app.dfuse.io because of the recent pricing changes. It will allow users to select a free account for testnets (dfuse) or the Community Edition (EOS Nation).

Subsequently, we could have 2 buttons, one with a link to the free testnet account, and one to the CE account, but it will become hard to maintain at some point. I believe that the first approach is best.