maintainers: add carlthome

maintainers/maintainer-list.nix

···
     githubId = 82591;
     name = "Carl Sverre";
   };
+  carlthome = {
+    name = "Carl Thomé";
+    email = "[e-mail]";
+    github = "carlthome";
+    githubId = 1595907;
+  };
   carpinchomug = {
     email = "[e-mail]";
     github = "carpinchomug";