feat: add disko disk layout for blade (single SSD)

hosts/blade/disko.nix

@@ -0,0 +1,31 @@
+{
+  disko.devices = {
+    disk.main = {
+      type = "disk";
+      device = "/dev/sda";
+      content = {
+        type = "gpt";
+        partitions = {
+          boot = {
+            size = "1G";
+            type = "EF00";
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+              mountOptions = [ "fmask=0022" "dmask=0022" ];
+            };
+          };
+          root = {
+            size = "100%";
+            content = {
+              type = "filesystem";
+              format = "ext4";
+              mountpoint = "/";
+            };
+          };
+        };
+      };
+    };
+  };
+}