move server configs into new structure

flake.nix

@@ -45,21 +45,15 @@
         ## ---- servers ----
         ursa-minor = nixpkgs.lib.nixosSystem {
           system = "aarch64-linux";
-          modules = [
-            ./ursa-minor/configuration.nix
-          ];
+          modules = [ ./config/hosts/ursa-minor ];
         };
         ursa-major = nixpkgs.lib.nixosSystem {
           system = "aarch64-linux";
-          modules = [
-            ./ursa-major/configuration.nix
-          ];
+          modules = [ ./config/hosts/ursa-major ];
         };
         atauno = nixpkgs.lib.nixosSystem {
           system = "aarch64-linux";
-          modules = [
-            ./atauno/configuration.nix
-          ];
+          modules = [ ./config/hosts/atauno ];
         };
       };
     };