[messaging] New location for the CONIKS website

[Marcela S. Melara]

Hi everyone,

I would like to announce that we've migrated the CONIKS website to https://coniks.cs.princeton.edu. My apologies if you receive this message twice. 

Our coniks.org site has been canceled and will not longer be available within a few days. We're sorry for any confusion (and broken links) this transition may cause!

Best,
Marcela