🖌️ Goodbye Stylix

- Added theming to Btop
- Added theming to Nvim and removed bufferline plugin
- Added mode to theme.nix to change from light theme to dark theme
- Replaced Starship theme with Catppuccin starship theme
- Added QT platformtheme ENV
- Moved wallpapers into wallpaper dir
- Replaced image of desktop1 with more up to date one

modules/qt.nix

@@ -1,11 +1,16 @@
 { pkgs, ... }:
 
 {
-  environment.systemPackages = with pkgs.kdePackages; [
-    qtwayland
-    qtsvg
-    qt6ct
-  ];
+  environment = {
+    sessionVariables = {
+      QT_QPA_PLATFORMTHEME = "qt6ct";
+    };
+    systemPackages = with pkgs.kdePackages; [
+      qtwayland
+      qtsvg
+      qt6ct
+    ];
+  };
 
   qt.enable = true;
 }