Removed comment about quant-ph, link to draftable redevelopment

Hi Bill,

  I know you're not developing Scirate anymore, but here is a very trivial pull request to remove a comment on the About page, if you wish to merge it. I'm removing it because I don't believe it is true, and more than one person has mentioned it to me as a reason to *not* use Scirate.

  I also added a link to the new development of Scirate.

--
Noon