add flake things

flake.nix

@@ -0,0 +1,25 @@
+{
+  description = "website";
+
+  inputs = { nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable"; };
+
+  outputs = { self, nixpkgs }:
+    let
+      inherit (nixpkgs) lib;
+      inherit (builtins) attrValues;
+      eachSystem = f:
+        lib.genAttrs [ "x86_64-linux" ]
+        (system: f nixpkgs.legacyPackages.${system});
+    in {
+
+      devShells = eachSystem (pkgs: {
+        default = pkgs.mkShell {
+          packages = attrValues {
+            inherit (pkgs) pnpm;
+            inherit (pkgs.nodePackages_latest) "@astrojs/language-server";
+          };
+        };
+      });
+
+    };
+}