docs: remove asset_id documentation

Author: voronkovich

docs/reference/configuration.md

@@ -1013,12 +1013,6 @@ Default: `https://help.joomla.org/proxy?keyref=Help{major}{minor}:{keyref}&lang=
 
 Env: `JOOMLA_HELPURL`
 
-### asset_id
-
-Asset ID.
-
-Default: `1`
-
 ### offline
 
 Enable offline mode.
@@ -1072,7 +1066,6 @@ public $force_ssl    = 2;
 public $access       = 2;
 public $frontediting = 2;
 public $helpurl      = 'https://example.com/proxy?keyref=Help{major}{minor}:{keyref}&lang={langcode}';
-public $asset_id     = 42;
 
 public $offline                 = true;
 public $offline_message         = 'Maintenance';
@@ -1094,7 +1087,6 @@ JOOMLA_FORCE_SSL=2
 JOOMLA_SITE_ACCESS=2
 JOOMLA_SITE_FRONT_EDITING=2
 JOOMLA_HELPURL='https://example.com/proxy?keyref=Help{major}{minor}:{keyref}&lang={langcode}'
-# asset_id is not available as an environment variable
 
 JOOMLA_SITE_OFFLINE=true
 JOOMLA_SITE_OFFLINE_MESSAGE=Maintenance