Add table of contents generation and header ID processing to Articles class

- Implemented `generateTableOfContents` method to create a structured table of contents from article content.
- Added `processHeaders` method to ensure headers have unique IDs for linking.
- Updated `generateHeadersIds` to apply ID generation to headers in article content.
- Modified `article_full` method to include table of contents in rendered articles.
- Enhanced `submenu_details` and `subpages` methods in Menu class to support language ID.
- Updated caching mechanisms to include language ID for subpages and menu details.
- Refactored various methods in Articles view class for improved readability and consistency.
- Added new sftp configuration file for deployment settings.

autoload/front/view/class.Site.php

@@ -109,7 +109,7 @@ class Site
     {
       $submenu_tmp = explode( ':', $submenu_tmp );
       $html = str_replace( '[SUBMENU:' . $submenu_tmp[1] . ']', \front\view\Menu::submenu(
-                                                                  \front\factory\Menu::submenu_details( $submenu_tmp[1] ), $page['id'], $submenu_tmp[1]
+                                                                  \front\factory\Menu::submenu_details( $submenu_tmp[1], $lang_id ), $page['id'], $submenu_tmp[1]
                                                                 ), $html );
     }