refactor: Move user config into modules/

modules/home/users/crumb/emacs/project-skeletons/haskell-flake/flake.nix

@@ -0,0 +1,36 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, ... }@inputs:
+    inputs.flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        hlib = pkgs.haskell.lib.compose;
+        hpkgs = pkgs.haskell.packages.ghc98.extend (final: prev: {
+          __PROJECT-NAME__ =
+            hlib.dontCheck (final.callCabal2nix "__PROJECT-NAME__" ./. {});
+        });
+      in {
+        packages = rec {
+          __PROJECT-NAME__ = hpkgs.__PROJECT-NAME__;
+          default = __PROJECT-NAME__;
+        };
+
+        devShells.default = hpkgs.shellFor {
+          packages = p: [
+            p.__PROJECT-NAME__
+          ];
+          nativeBuildInputs = [
+            hpkgs.cabal-fmt
+            hpkgs.fourmolu
+            hpkgs.haskell-language-server
+            hpkgs.cabal-install
+            hpkgs.hasktags
+          ];
+          withHoogle = true;
+        };
+      });
+}