add general settings tab to settings page

settings.php

@@ -42,6 +42,8 @@ if ($ADMIN->fulltree) {
     $setting->set_updatedcallback('theme_reset_all_caches');
     $page->add($setting);
 
+    $settings->add($page);
+
     // Advanced settings.
     $page = new admin_settingpage('theme_boost_o365teams_advanced', get_string('advancedsettings', 'theme_boost_o365teams'));