maintainers: remove the numtide team (#268684)

It doesn't really make sense for us as team members are focused on
different things. At the end of the day it's the individuals that do the
work.

maintainers/team-list.nix

···
     enableFeatureFreezePing = true;
   };
 
-  numtide = {
-    members = [
-      mic92
-      flokli
-      jfroche
-      tazjin
-      zimbatm
-    ];
-    scope = "Group registration for Numtide team members who collectively maintain packages.";
-    shortName = "Numtide team";
-  };
-
   ocaml = {
     members = [
       alizter

nixos/modules/services/networking/nar-serve.nix

···
 in
 {
   meta = {
-    maintainers = [ maintainers.rizary ];
+    maintainers = [ maintainers.rizary maintainers.zimbatm ];
   };
   options = {
     services.nar-serve = {

pkgs/development/tools/treefmt/default.nix

···
     description = "one CLI to format the code tree";
     homepage = "https://github.com/numtide/treefmt";
     license = lib.licenses.mit;
-    maintainers = lib.teams.numtide.members;
+    maintainers = [ lib.maintainers.zimbatm ];
   };
 }

pkgs/tools/misc/direnv/default.nix

···
     '';
     homepage = "https://direnv.net";
     license = licenses.mit;
-    maintainers = teams.numtide.members;
+    maintainers = [ maintainers.zimbatm ];
     mainProgram = "direnv";
   };
 }

pkgs/tools/nix/nar-serve/default.nix

···
     description = "Serve NAR file contents via HTTP";
     homepage = "https://github.com/numtide/nar-serve";
     license = licenses.mit;
-    maintainers = with maintainers; [ rizary ];
+    maintainers = with maintainers; [ rizary zimbatm ];
   };
 }