Add (verified) named ROFL application ids

[tjanez]

Also add icons and links to homepage if ROFL-powered apps have them.

[ptrus]

Let's just extend the existing named-addressed JSON we already use: https://github.com/oasisprotocol/nexus/blob/33a378317ec380582329d6a66cfbfcfcc34aa850/named-addresses/mainnet_sapphire.json

cc @lukaw3d @buberdds

For links we could also re-use existing ROFL metadata. But there's no icon there yet. I think since the number of "official/verified" ROFL apps is small, we can just go with harcoding for now.