created a disks folder that contains all disko formats

added the default normal layout

disks/normal.nix

@@ -0,0 +1,35 @@
+{ disk, ... }:
+
+{
+  disko.devices = {
+    disk = {
+      ${disk} = {
+        device = "/dev/disk/by-id/${disk}";
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              type = "EF00";
+              size = "2G";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}