Added nixos configs

system-master/home/apps/defaults-apps.nix

@@ -0,0 +1,9 @@
+{ config, pkgs, lib, ... }:
+{
+  xdg.mimeApps.enable = true;
+  xdg.mimeApps.defaultApplications = {
+    "x-scheme-handler/http"  = [ "app.zen_browser.zen.desktop" ];
+    "x-scheme-handler/https" = [ "app.zen_browser.zen.desktop" ];
+    "text/html"              = [ "app.zen_browser.zen.desktop" ];
+  };
+}

system-master/home/apps/theme.nix

@@ -0,0 +1,22 @@
+{ pkgs, ...}:
+{
+  gtk = {
+    enable = true;
+    colorScheme = "dark";
+    theme = {
+      name = "Catppuccin-GTK-Grey-Dark-Compact";
+      package = (pkgs.magnetic-catppuccin-gtk.override {
+        accent = [ "grey" ];
+        shade = "dark";
+        tweaks = [ "black" ];
+        size = "compact";
+      });
+    };
+    iconTheme.name = "Papirus-Dark";
+  };
+  catppuccin.enable = true;
+  catppuccin.flavor = "mocha";
+  catppuccin.accent = "blue";
+  catppuccin.gtk.icon.enable = true;
+  catppuccin.cursors.enable = true;
+}