Lets get bitcoin icons into react-icons!

I thought it would be pretty cool if we could get the library over at bitcoinicons.com into the set which besides being more convenient for our code base other developers would be exposed to the bitcoin design community.

Who up for opening up the issue and do comms with the project? It's important to show there is also demand, perhaps by referencing other projects (in bitcoin) that use the library. We do use it @boltfun, since it's difficult to get glyphs for random icons we need from a single set.