Describe how to create fork in README

.envrc

@@ -1 +0,0 @@
-use flake

README.md

@@ -16,11 +16,6 @@ fix it.
 git clone --recursive git@git.wip.sh:<your-username>/lua-exercises.git
 ```
 
-Once you have a local clone of the repo, `cd` into the directory and
-run `nix develop .` to activate the development environment.  The
-first time you do this it might take a little while but it should be
-fairly fast afterwards.
-
 ## Doing the Exercises
 
 It's recommended that you roughly stick to the defined order of the

flake.lock

@@ -1,40 +0,0 @@
-{
-  "nodes": {
-    "flake-schemas": {
-      "locked": {
-        "lastModified": 1697467827,
-        "narHash": "sha256-j8SR19V1SRysyJwpOBF4TLuAvAjF5t+gMiboN4gYQDU=",
-        "rev": "764932025c817d4e500a8d2a4d8c565563923d29",
-        "revCount": 29,
-        "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/DeterminateSystems/flake-schemas/0.1.2/018b3da8-4cc3-7fbb-8ff7-1588413c53e2/source.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/DeterminateSystems/flake-schemas/%2A.tar.gz"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1702346276,
-        "narHash": "sha256-eAQgwIWApFQ40ipeOjVSoK4TEHVd6nbSd9fApiHIw5A=",
-        "rev": "cf28ee258fd5f9a52de6b9865cdb93a1f96d09b7",
-        "revCount": 553141,
-        "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2311.553141%2Brev-cf28ee258fd5f9a52de6b9865cdb93a1f96d09b7/018c652c-2ff2-777b-bade-dae9c2abe1e1/source.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/%2A.tar.gz"
-      }
-    },
-    "root": {
-      "inputs": {
-        "flake-schemas": "flake-schemas",
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}

flake.nix

@@ -1,28 +0,0 @@
-{
-  description = "Environment for Lua programming exercises";
-  inputs = {
-    flake-schemas.url = "https://flakehub.com/f/DeterminateSystems/flake-schemas/*.tar.gz";
-    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*.tar.gz";
-  };
-
-  outputs = { self, flake-schemas, nixpkgs }:
-    let
-      supportedSystems = [
-        "x86_64-linux"
-        "aarch64-darwin"
-        "x86_64-darwin"
-        "aarch64-linux"
-      ];
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
-    in {
-      schemas = flake-schemas.schemas;
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          name = "lua-exercises";
-          packages = with pkgs; [ git lua ];
-        };
-      });
-    };
-}