init window tabs, init gemtext parser, refactor app sceleton

src/Yoda.php

@@ -9,6 +9,56 @@ require_once __DIR__ .
 // Init app
 \Gtk::init();
 
-new \Yggverse\Yoda\Controller\Browser();
+$config = \Yggverse\Yoda\Model\File::getConfig(); // @TODO
+
+$window = new \GtkWindow();
+
+$window->set_size_request(
+    $config->window->width,
+    $config->window->height
+);
+
+if ($config->window->header->enabled)
+{
+    $header = new \GtkHeaderBar();
+
+    $header->set_title(
+        $config->window->title
+    );
+
+    $header->set_show_close_button(
+        $config->window->header->button->close
+    );
+
+    $window->set_titlebar(
+        $header
+    );
+}
+
+$window->connect(
+    'destroy',
+    function()
+    {
+        \Gtk::main_quit();
+    }
+);
+
+$page = new \Yggverse\Yoda\Tab\Page();
+
+$page->open(
+    'yoda://welcome'
+);
+
+$tab = new \GtkNotebook();
+
+$tab->add(
+    $page->box
+);
+
+$window->add(
+    $tab
+);
+
+$window->show_all();
 
 \Gtk::main();