reorganize widget modules

src/browser/main/tab/page/mod.rs

@@ -1,23 +1,31 @@
 mod content;
 mod navigation;
-mod widget;
+
+use gtk::prelude::BoxExt;
+use gtk::{Box, Orientation};
 
 pub struct Page {
-    widget: widget::Page,
+    widget: Box,
 }
 
 impl Page {
     pub fn new() -> Page {
-        Self {
-            widget: widget::Page::new(
-                navigation::Navigation::new().widget().gtk(),
-                content::Content::new().widget().gtk(),
-            ),
-        }
+        // Init components
+        let navigation = navigation::Navigation::new();
+        let content = content::Content::new();
+
+        // Init widget
+        let widget = Box::builder().orientation(Orientation::Vertical).build();
+
+        widget.append(navigation.widget());
+        widget.append(content.widget());
+
+        // Result
+        Self { widget }
     }
 
     // Getters
-    pub fn widget(&self) -> &widget::Page {
+    pub fn widget(&self) -> &Box {
         &self.widget
     }
 }