chore: Simplify snapcraft

snap/snapcraft.yaml

@@ -67,16 +67,7 @@ parts:
     stage-packages:
       - libsecret-1-dev
       - libjsoncpp-dev
-  gnome-3-28-extension:
-    build-packages:
-      - gcc
-      - libgtk-3-dev
-    make-parameters:
-      - PLATFORM_PLUG=gnome-3-28-1804
-    plugin: make
-    source: $SNAPCRAFT_EXTENSIONS_DIR/desktop
-    source-subdir: gnome
-
+      
 slots:
   dbus-svc:
     interface: dbus
@@ -85,6 +76,8 @@ slots:
 
 apps:
   fluffychat:
+    extensions:
+      - gnome-3-28
     command: fluffychat
     plugs:
       - desktop
@@ -97,29 +90,3 @@ apps:
       - home
     slots:
       - dbus-svc
-    #command-chain:
-    #  - snap/command-chain/desktop-launch
-assumes:
-  - snapd2.43
-plugs:
-  gnome-3-28-1804:
-    default-provider: gnome-3-28-1804
-    interface: content
-    target: $SNAP/gnome-platform
-  gtk-3-themes:
-    default-provider: gtk-common-themes
-    interface: content
-    target: $SNAP/data-dir/themes
-  icon-themes:
-    default-provider: gtk-common-themes
-    interface: content
-    target: $SNAP/data-dir/icons
-  sound-themes:
-    default-provider: gtk-common-themes
-    interface: content
-    target: $SNAP/data-dir/sounds
-environment:
-  SNAP_DESKTOP_RUNTIME: $SNAP/gnome-platform
-#layout:
-#  /usr/share/xml/iso-codes:
-#    bind: $SNAP/gnome-platform/usr/share/xml/iso-codes