Replaced google dashboard charts with Chart.js (via composer)

.gitignore

@@ -23,12 +23,15 @@
 /app/etc/modules/Cm_RedisSession.xml
 /lib/Credis
 
-# flow.js library
-/js/lib/uploader
+# ChartJs library
+/js/lib/chartjs
 
 # TinyMCE library
 /js/lib/tinymce
 
+# flow.js library
+/js/lib/uploader
+
 # Add development environment setup files and README
 # https://github.com/OpenMage/magento-lts/pull/1012
 /dev/openmage/docker-magento

app/code/core/Mage/Adminhtml/Block/Dashboard.php

@@ -24,6 +24,9 @@ class Mage_Adminhtml_Block_Dashboard extends Mage_Adminhtml_Block_Template
 
     /**
      * Location of the "Enable Chart" config param
+     *
+     * @deprecated
+     * @see Mage_Adminhtml_Helper_Dashboard_Data::XML_PATH_ENABLE_CHARTS
      */
     public const XML_PATH_ENABLE_CHARTS = 'admin/dashboard/enable_charts';
 
@@ -60,7 +63,9 @@ protected function _prepareLayout()
             $this->getLayout()->createBlock('adminhtml/dashboard_searches_top'),
         );
 
-        if (Mage::getStoreConfig(self::XML_PATH_ENABLE_CHARTS)) {
+        /** @var Mage_Adminhtml_Helper_Dashboard_Data $helper */
+        $helper = Mage::helper('adminhtml/dashboard_data');
+        if ($helper->isChartEnabled()) {
             $block = $this->getLayout()->createBlock('adminhtml/dashboard_diagrams');
         } else {
             $block = $this->getLayout()->createBlock('adminhtml/template')