Update docs

Magesail/Controller/Adminhtml/Settings/Index.php

@@ -0,0 +1,24 @@
+<?php
+declare(strict_types=1);
+
+namespace MageSail\Magesail\Controller\Adminhtml\Settings;
+
+use Magento\Backend\App\Action;
+use Magento\Framework\App\Action\HttpGetActionInterface;
+use Magento\Framework\Controller\ResultInterface;
+
+/**
+ * Entry point from MageSail admin menu; forwards to core system config for section {@see system.xml}.
+ */
+class Index extends Action implements HttpGetActionInterface
+{
+    public const ADMIN_RESOURCE = 'MageSail_Magesail::config';
+
+    public function execute(): ResultInterface
+    {
+        return $this->resultRedirectFactory->create()->setPath(
+            'adminhtml/system_config/edit',
+            ['section' => 'magesail', '_current' => false]
+        );
+    }
+}