New config as a flake

flake.nix

@@ -0,0 +1,39 @@
+{
+  description = "My opinionated Emacs";
+
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    emacs-overlay.url = "github:nix-community/emacs-overlay";
+    emacs-src = {
+      url = "git://git.savannah.gnu.org/emacs.git?branch=emacs29";
+      flake = false;
+    };
+    nixpkgs.follows = "emacs-overlay/nixpkgs";
+  };
+
+  outputs = inputs @ {
+    flake-parts,
+    nixpkgs,
+    ...
+  }:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      systems = ["x86_64-linux"];
+      imports = [
+        # flake-parts.flakeModules.easyOverlay
+        ./packages
+        ./hmModules
+        ./formatter
+      ];
+    };
+
+  nixConfig = {
+    extra-substituters = [
+      "https://aciceri-fleet.cachix.org"
+      "https://nix-community.cachix.org"
+    ];
+    extra-trusted-public-keys = [
+      "aciceri-fleet.cachix.org-1:e1AodrwmzRWy0eQi3lUY71M41fp9Sq+UpuKKv705xsI="
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+    ];
+  };
+}