Finish modularising config

There are still some things I want to change, but at least there aren't two systems now.

modules/theming.nix

@@ -0,0 +1,77 @@
+{ config, lib, pkgs, ... }:
+
+{
+  options.chvp.theming.enable = lib.mkOption {
+    default = false;
+    example = true;
+  };
+
+  config = lib.mkIf config.chvp.theming.enable {
+    fonts = {
+      fontDir.enable = true;
+      fontconfig = {
+        enable = true;
+        defaultFonts = {
+          emoji = [ "Noto Color Emoji" ];
+          monospace = [ "Fira Code" ];
+          sansSerif = [ "Noto Sans" ];
+          serif = [ "Noto Serif" ];
+        };
+      };
+      fonts = with pkgs; [
+        fira-code
+        fira-code-symbols
+        font-awesome_4
+        noto-fonts
+        noto-fonts-cjk
+        noto-fonts-emoji
+        noto-fonts-extra
+      ];
+    };
+
+    home-manager.users.charlotte = { pkgs, ... }: {
+      home.packages = [ pkgs.vanilla-dmz ];
+      home.file = {
+        ".icons/default/index.theme".text = ''
+          [Icon Theme]
+          Name=Default
+          Comment=Default Cursor Theme
+          Inherits=Vanilla-DMZ
+        '';
+      };
+      dconf.settings."org/gnome/desktop/interface" = {
+        gtk-theme = "Arc";
+        icon-theme = "Arc";
+        cursor-theme = "Vanilla-DMZ";
+      };
+      gtk = {
+        enable = true;
+        font = {
+          package = pkgs.noto-fonts;
+          name = "Noto Sans";
+          size = 10;
+        };
+        gtk2.extraConfig = ''
+          gtk-cursor-theme-name = "Vanilla-DMZ"
+          gtk-cursor-theme-size = 0
+        '';
+        gtk3.extraConfig = {
+          gtk-cursor-theme-name = "Vanilla-DMZ";
+          gtk-cursor-theme-size = 0;
+        };
+        iconTheme = {
+          package = pkgs.arc-icon-theme;
+          name = "Arc";
+        };
+        theme = {
+          package = pkgs.arc-theme;
+          name = "Arc";
+        };
+      };
+      qt = {
+        enable = true;
+        platformTheme = "gtk";
+      };
+    };
+  };
+}