feat: set up 'stylix'

modules/stylix/theme.nix

@@ -0,0 +1,16 @@
+{ pkgs }:
+
+{
+  polarity = "dark";
+  base16Scheme = ./zenwritten-dark.yaml;
+  override = {
+    base04 = "8E8E8E";
+  };
+  image = pkgs.runCommand "solid-bg.png" { nativeBuildInputs = [ pkgs.imagemagick ]; } ''
+    magick -size 1x1 xc:#191919 $out
+  '';
+  monospaceFont = {
+    package = pkgs.iosevka-bin.override { variant = "SS08"; };
+    name = "Iosevka Term SS08";
+  };
+}