Clean up .json and json schema and fix safety issue

[MaikuZ]

We shouldn't really be using data from the .json, because it's not safe. The only safe thing in the .json is the description and title provided that it hashes itself to the correct hash from the blockchain. So it's the only data that we can be sure of its validity. Therefore we need to get rid of everything else in the .json and also we should check if the ttile+description hashes itself to the hash in project details page, I think.