Abandon flakes in favour of npins

Flakes copy the whole gigantic repo to store all the time, quickly eating all the drive capacity.

default.nix

@@ -1,14 +1,15 @@
-# SPDX-FileCopyrightText: 2022 Jan Tojnar
+# SPDX-FileCopyrightText: 2024 Jan Tojnar
 # SPDX-License-Identifier: MIT
 
 let
-  lock = builtins.fromJSON (builtins.readFile ./flake.lock);
-  flake-compat = builtins.fetchTarball {
-    url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
-    sha256 = lock.nodes.flake-compat.locked.narHash;
-  };
-  flake = import flake-compat {
-    src = ./.;
+  sources = import ./npins;
+  pkgs = import sources.nixpkgs { };
+
+  haskellPackages = pkgs.haskellPackages.override {
+    overrides = final: prev: {
+      hakyll-contrib-tojnar = final.callPackage "${sources.hakyll-contrib-tojnar}/hakyll-contrib-tojnar.nix" { };
+      mala-zahradka-pro-radost-cz = final.callPackage ./site/mala-zahradka-pro-radost-cz.nix { };
+    };
   };
 in
-flake.defaultNix
+haskellPackages.mala-zahradka-pro-radost-cz