complete widget submodule refactory

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

@@ -1,8 +1,19 @@
-use gtk::Box;
-// use gtk::prelude::BoxExt; @TODO append
+mod widget;
 
-pub fn new() -> Box {
-    Box::builder()
-        .orientation(gtk::Orientation::Vertical)
-        .build()
+pub struct Content {
+    widget: widget::Content,
+}
+
+impl Content {
+    // Construct
+    pub fn new() -> Content {
+        Self {
+            widget: widget::Content::new(),
+        }
+    }
+
+    // Getters
+    pub fn widget(&self) -> &widget::Content {
+        &self.widget
+    }
 }