add nix devshell (flake based)

butterfly.txt

@@ -0,0 +1,45 @@
+# ================ BEGIN ================ #
+                `         '
+;,,,             `       '             ,,,;
+`CRY6666bo.       :     :       .od8888CRY'
+  888IO8DO88b.     :   :     .d8888I8DO88
+  8LOVEY'  `Y8b.   `   '   .d8Y'  `YLOVE8
+ jTHEE!  .db.  Yb. '   ' .dY  .db.  8THEE!
+   `888  Y88Y    `q ( ) p'    Y88Y  888'
+    8MYb  '"        ,',        "'  dMY8
+   j8prECIOUSgf"'   ':'   `"?g8prECIOUSk
+     'Y'   .8'     d' 'b     '8.   'Y'
+      !   .8' db  d'; ;`b  db '8.   !
+         d88  `'  8 ; ; 8  `'  88b
+        d88Ib   .g8 ',' 8g.   dI88b
+       :888BAUD88Y'     'Y88BAUD888:
+       '! BAUD888'       `888BAUD !'
+          '8Y  `Y         Y'  Y8'
+           Y                   Y
+           !                   !
+# ================= END ================= #
+
+
+
+>>> Original:
+# ================ BEGIN ================ #
+                `         '
+;,,,             `       '             ,,,;
+`YES8888bo.       :     :       .od8888YES'
+  888IO8DO88b.     :   :     .d8888I8DO88
+  8LOVEY'  `Y8b.   `   '   .d8Y'  `YLOVE8
+ jTHEE!  .db.  Yb. '   ' .dY  .db.  8THEE!
+   `888  Y88Y    `b ( ) d'    Y88Y  888'
+    8MYb  '"        ,',        "'  dMY8
+   j8prECIOUSgf"'   ':'   `"?g8prECIOUSk
+     'Y'   .8'     d' 'b     '8.   'Y'
+      !   .8' db  d'; ;`b  db '8.   !
+         d88  `'  8 ; ; 8  `'  88b
+        d88Ib   .g8 ',' 8g.   dI88b
+       :888LOVE88Y'     'Y88LOVE888:
+       '! THEE888'       `888THEE !'
+          '8Y  `Y         Y'  Y8'
+           Y                   Y
+           !                   !
+# ================= END ================= #
+

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1753489912,
+        "narHash": "sha256-uDCFHeXdRIgJpYmtcUxGEsZ+hYlLPBhR83fdU+vbC1s=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "13e8d35b7d6028b7198f8186bc0347c6abaa2701",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,27 @@
+# Template: https://nixos-and-flakes.thiscute.world/development/intro
+{
+  description = "Dev Shell for dobutterfliescry.net";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+  };
+
+  outputs = {nixpkgs, ...}: let
+    system = "x86_64-linux";
+  in {
+    devShells."${system}".default = let
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+    in
+      pkgs.mkShell {
+        packages = with pkgs; [
+          bash
+          simple-http-server
+          imagemagick
+        ];
+
+        shell = "${pkgs.bash}/bin/bash";
+      };
+  };
+}