Remove sociomantic from "orgs using D"

It no longer exists and the company that bought it no longer works in D.

Author: Marenz

orgs-using-d.dd

@@ -201,14 +201,6 @@ $(DIVC orgs-using-d center,
             $(FA_GITHUB veelo/Pascal2D)
         )
     )
-    $(DORG Sociomantic, https://www.sociomantic.com, sociomantic.png,
-        Real-time personalized advertising,
-        Key infrastructure in D - main sponsor of D conference 2016 and 2017.
-        $(LINK_ROW
-            $(FA_TALK dconf.org/2016/talks/lucarella.html, DConf talk) $(FA_SEPARATOR)
-            $(FA_HIRING www.sociomantic.com/jobs/d-software-developer)
-        )
-    )
     $(DORG Symmetry Investments, http://symmetryinvestments.com/about-us/, symmetry.png,
         Alternative Investment Management,
         Analytics and investment tools.