Switch from shell.nix to flake.nix

docs/DEVELOPMENT.MD

@@ -61,7 +61,7 @@ install it before you can build an ISO automatically. To do so, you can run
 
 ### Dependencies
 
-If you use NixOS or the Nix package manager, simply run `nix-shell` in the root
+If you use NixOS or the Nix package manager, simply run `nix develop` in the root
 directory. All necessary dependencies will be made available.
 
 If not, the following dependencies will need to be manually installed:

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1791739280,
+        "narHash": "sha256-1dwyb7Xh8eTR6ZP+C5u+DZatS7KROgozx8qo7CSZNMk=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "4c28db8c9abaf2a6a117f96cc16ddb17b8eb70cc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "Nix devshells!";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/master";
+  };
+
+  outputs = {nixpkgs, ...}: let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs { inherit system; };
+  in {
+    devShells.${system}.default = pkgs.mkShell {
+      packages = with pkgs ; [
+        bash
+        limine-full
+        xorriso
+        rustup
+        qemu
+        cargo-make
+        cargo-binutils
+      ];
+      shellHook = ''
+        rustup default nightly;
+        rustup target add x86_64-unknown-none;
+        export LIMINEDIR="${pkgs.limine-full}/share/limine"
+      '';
+    };
+  };
+}