add flake template with hugo binary in dev shell

flake.nix

@@ -0,0 +1,40 @@
+{
+  description = "A flake containing a development environment for the CCCB website.";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
+  };
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
+          system:
+          f rec {
+            pkgs = nixpkgs.legacyPackages.${system};
+            inherit system;
+          }
+        );
+    in
+    {
+      devShells = forAllSystems (
+        { pkgs, ... }:
+        {
+          default = pkgs.mkShell rec {
+            packages = with pkgs; [
+              hugo
+              go
+              (pkgs.python3.withPackages (python-pkgs: [
+                python-pkgs.icalendar
+                python-pkgs.pytz
+              ]))
+            ];
+          };
+        }
+      );
+
+      formatter = forAllSystems ({ pkgs, ... }: pkgs.nixfmt-rfc-style);
+    };
+}