Revert "Add devenv"

This reverts commit fa87a28f9e.

flake.nix

@@ -0,0 +1,19 @@
+# Do not edit this file. It is automatically generated by https://www.oliverdavies.uk/build-configs.
+{
+  description = "A Nix Flake for oliverdavies-uk";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+
+      inherit (pkgs) mkShell;
+    in {
+      devShells.${system}.default =
+        mkShell { buildInputs = with pkgs; [ bashInteractive nodePackages.pnpm nodejs php82 php82Packages.composer ]; };
+
+      formatter.${system} = pkgs.nixfmt;
+    };
+}