feat: set up 'stylix'

modules/stylix/default.nix

@@ -0,0 +1,37 @@
+{
+  config,
+  inputs,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ inputs.stylix.nixosModules.stylix ];
+
+  stylix = {
+    enable = true;
+    polarity = "dark";
+    base16Scheme = ../stylix/zenwritten-dark.yaml;
+    image = pkgs.runCommand "solid-bg.png" { nativeBuildInputs = [ pkgs.imagemagick ]; } ''
+      magick -size 1x1 xc:#191919 $out
+    '';
+    fonts = {
+      monospace = {
+        package = pkgs.iosevka-bin.override { variant = "SS08"; };
+        name = "Iosevka Term SS08";
+      };
+      serif = config.stylix.fonts.monospace;
+      sansSerif = config.stylix.fonts.monospace;
+      emoji = config.stylix.fonts.monospace;
+    };
+    autoEnable = true;
+  };
+
+  home-manager.sharedModules = [
+    {
+      stylix.targets = {
+        firefox.profileNames = [ "default" ];
+      };
+    }
+  ];
+}