Remove coturn, never used, Mumble better anyway

modules/system/services/server/socialserver/matrix/coturn/nginx/default.nix

@@ -1,22 +0,0 @@
-{ config, lib, ... }:
-{
-  config = lib.mkIf config.services.coturn.enable {
-    services.nginx.virtualHosts."turn.jimbosfiles.com" = {
-      enableACME = true;
-      forceSSL = true;
-      listen = [{
-        addr = "0.0.0.0";
-        port = 80;
-        ssl = false; 
-      }];
-      locations."/".proxyPass = "http://127.0.0.1:1380";
-    };
-
-    security.acme.certs = {       
-      "turn.jimbosfiles.com" = {
-        group = "turnserver";
-        postRun = "systemctl restart coturn.service";
-      };
-    };
-  };
-}