Migrate Timeless configs to ManageWikiSettings (#3436)

* Migrate $wgTimelessWordmark to ManageWikiSettings

* Add other timeless configs

* add timeless configs

LocalSettings.php

@@ -3336,9 +3336,14 @@
 	],
 
 	// Timeless
+	'wgTimelessBackdropImage' => [
+		'default' => 'cat.svg',
+	],
+	'wgTimelessLogo' => [
+		'default' => null,
+	],
 	'wgTimelessWordmark' => [
 		'default' => null,
-		'closinglogosgroupwiki' => 'CLGHorizontal.png',
 	],
 
 	// Timezone

ManageWikiSettings.php

@@ -1890,6 +1890,33 @@
 		'section' => 'styling',
 		'help' => 'Set to your wiki\'s page name at <a href="https://www.wikiapiary.com">Wikiapiary</a> to add the monitored by Wikiapary footer icon. If you do not have an article there for your wiki, please leave this field blank.',
 	],
+	'wgTimelessBackdropImage' => [
+		'name' => 'Timeless Backdrop Image',
+		'from' => 'mediawiki',
+		'restricted' => false,
+		'type' => 'text',
+		'overridedefault' => 'cat.svg',
+		'section' => 'styling',
+		'help' => 'Set to the filename, excluding the File namespace, of a background image to use for the Timeless skin.',
+	],
+	'wgTimelessLogo' => [
+		'name' => 'Timeless Logo',
+		'from' => 'mediawiki',
+		'restricted' => false,
+		'type' => 'text',
+		'overridedefault' => null,
+		'section' => 'styling',
+		'help' => 'Set to the filename, excluding the File namespace, of a logo to use for the Timeless skin.',
+	],
+	'wgTimelessWordmark' => [
+		'name' => 'Timeless Wordmark',
+		'from' => 'mediawiki',
+		'restricted' => false,
+		'type' => 'text',
+		'overridedefault' => null,
+		'section' => 'styling',
+		'help' => 'Set to the filename, excluding the File namespace, of a wordmark to use for the Timeless skin.',
+	],
 	'wgMetrolookDownArrow' => [
 		'name' => 'Metrolook Down Arrow',
 		'from' => 'metrolook',