🖼 Replaced Dolphin with Nauvis, mime types, image-viewer

- Added Gstreamer packages for audio data
- Replaced catppuccin wallpaper on lockscreen with one where the logo is higher
- Replaced dolphin with nautilus file manager
- Moved Gnome related configs to /gnome
- Added Gnome appindicator and extension manager
- Added loupe and gimp
- Added mime types for image files

audio.nix

@@ -6,6 +6,11 @@
 {
 
   environment.systemPackages = with pkgs; [
+    gst_all_1.gstreamer
+    gst_all_1.gst-plugins-base
+    gst_all_1.gst-plugins-good
+    gst_all_1.gst-plugins-bad
+
     wireplumber
     playerctl # Interaction with audioplayers and browsers
     pavucontrol # GUI