implement refresh method

src/app/browser/main/tab/page.cpp

@@ -81,6 +81,11 @@ Glib::ustring Page::get_subtitle()
 }
 
 // Actions
+void Page::refresh()
+{
+    pageNavbar->refresh();
+}
+
 void Page::update()
 {
     title = _("Loading..");

src/app/browser/main/tab/page.hpp

@@ -55,6 +55,7 @@ namespace app::browser::main::tab
             Glib::ustring get_subtitle();
 
             // Actions
+            void refresh();
             void update();
     };
 }