now using flake-parts; refactored nixosConfigurations; using hm standalone

hosts/modules/common/boot.nix

@@ -0,0 +1,20 @@
+{ pkgs, ... }:
+
+{
+  boot = {
+    loader = {
+      timeout = 1;
+      efi.canTouchEfiVariables = true;
+      systemd-boot = {
+        enable = true;
+        editor = false;
+        consoleMode = "max";
+        sortKey = "aa";
+        netbootxyz = {
+          enable = true;
+          sortKey = "zz";
+        };
+      };
+    };
+  };
+}