Core rebrand changes (#24441)

* adding new icons

* Update logos to new logo

* use old sizing

* refresh top menu for rebranding

* fix issue with login page moving out of center on larger screens

* update screenshots

* update test and css and submodules

* update screenshots

---------

Co-authored-by: Matt <1169490+caddoo@users.noreply.github.com>

Author: chippison

core/Plugin/ThemeStyles.php

@@ -116,7 +116,7 @@ class ThemeStyles
     /**
      * @var string|array<string>
      */
-    public $colorTextLighter = ['#666666', '#999'];
+    public $colorTextLighter = ['#646464', '#999'];
 
     /**
      * @var string|array<string>
@@ -161,12 +161,12 @@ class ThemeStyles
     /**
      * @var string|array<string>
      */
-    public $colorHeaderBackground = ['#3450A3', '#2b3138'];
+    public $colorHeaderBackground;
 
     /**
      * @var string|array<string>
      */
-    public $colorHeaderText =  ['#fff', '#ccc'];
+    public $colorHeaderText;
 
     /**
      * @var string|array<string>
@@ -290,6 +290,8 @@ public function __construct(string $themeMode)
         $this->colorWidgetTitleBackground = $this->colorBackgroundContrast;
         $this->colorWidgetBackground = $this->colorBackgroundContrast;
         $this->colorWidgetBorder = $this->colorBackgroundTinyContrast;
+        $this->colorHeaderBackground = $this->colorBackgroundContrast;
+        $this->colorHeaderText = $this->colorTextLighter;
     }
 
     /**