move files to generic subfolder

configuration.nix

@@ -6,7 +6,6 @@ in
 {
   imports = [
     ./hardware-configuration.nix
-    ./files.nix
     ./users.nix
     ./generic/api/api.nix
     ./generic/modules/api.nix
@@ -25,6 +24,7 @@ in
     ./generic/services/webserver/memcached.nix
     ./generic/services/webserver/nginx.nix
     ./generic/system/limits.nix
+    ./generic/system/tmpfiles.nix
     ./generic/system/userdata.nix
   ];