add documentation links to customer-ui for certain entities; add setting to allow menu to be expanded

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

install/froxlor.sql.php

@@ -743,6 +743,7 @@ opcache.validate_timestamps'),
 	('panel', 'logo_overridetheme', '0'),
 	('panel', 'logo_overridecustom', '0'),
 	('panel', 'settings_mode', '0'),
+	('panel', 'menu_collapsed', '1'),
 	('panel', 'version', '2.1.0-dev1'),
 	('panel', 'db_version', '202305240');