Added more commands to code; refactored container classes; general cleanup

src/core/containers/left_container.py

@@ -22,13 +22,12 @@ class LeftContainer(Gtk.Box):
 
 
     def _setup_styling(self):
+        self.ctx = self.get_style_context()
+        self.ctx.add_class("left-container")
+
         self.set_orientation(Gtk.Orientation.VERTICAL)
-
         self.set_vexpand(True)
 
-        ctx = self.get_style_context()
-        ctx.add_class("left-container")
-
     def _setup_signals(self):
         ...