Allow filling of contract wizard with query params

[askdesigners]

For solos composer, we'd love to integrate more closely with dao.new, and I think allowing the form to be filled by query params would be an easy way to do this.

We generate all the IPFS links as well as store wallet addresses, resell % etc in our app, so if we could link into dao.new with simple query params it would make integration super easy and less error-prone.