New spice inputs for New.pm

New spice inputs for description, source domain, and template group. Option to create a relevancy block.

Connected changes in the spice repo - https://github.com/duckduckgo/zeroclickinfo-spice/pull/1034
Hmm this question should only be asked if we're in the Spice (and soon Goodies) repository. @DavidMascio I think we should re-structure the logic in this a bit (figure out which repo we're in first so we ask the right questions), or perhaps ask additional questions after determining the repo.