It has been scientifically proven that light mode text is easier to read. Has to do with light diffusion and contrast. Light characters blend into each other while black characters are sharp. Your pupils adjust to the overall brightness.
I'm totally in favor of a fully distributed solution! But you don't need a ledger for it, neither centralized nor distributed. A simple pub-sub + DHT, torrent style, should be enough.
Blockchain is the wrong solution for that problem.
Cool thanks I've put it on my wishlist.