clan-core: add clan meta for ui usage

templates/flake-module.nix

@@ -5,6 +5,10 @@
       description = "Initialize a new clan flake";
       path = ./new-clan;
     };
+    empty = {
+      description = "A empty clan template. Primarily for usage with the clan ui";
+      path = ./empty;
+    };
     default = self.templates.new-clan;
   };
 }