refactor: hemar reboot

devshell/dev/default.nix

@@ -0,0 +1,7 @@
+{
+  system,
+  self,
+  pkgs
+}: {
+  hemar      = import ./hemar.nix      { inherit self system pkgs; };
+}

devshell/dev/hemar.nix

@@ -0,0 +1,5 @@
+{ pkgs, ... }: pkgs.mkShell {
+  buildInputs = (with pkgs; [
+    dash
+  ]);
+}