Move gradients config to theme.json

[MAILPOET-5740]

mailpoet/lib/EmailEditor/Engine/SettingsController.php

@@ -77,12 +77,6 @@ class SettingsController {
     // Enabling alignWide allows full width for specific blocks such as columns, heading, image, etc.
     $settings['alignWide'] = true;
 
-    // Disable gradients. We cannot render them in emails.
-    $settings['disableCustomGradients'] = true;
-    $settings['__experimentalFeatures']['color']['customGradient'] = false;
-    $settings['__experimentalFeatures']['color']['defaultGradients'] = false;
-    $settings['__experimentalFeatures']['color']['gradients'] = [];
-
     return $settings;
   }
 

mailpoet/lib/EmailEditor/Engine/theme.json

@@ -2,6 +2,11 @@
   "$schema": "https://schemas.wp.org/trunk/theme.json",
   "version": 2,
   "settings": {
+    "color": {
+      "customGradient": false,
+      "defaultGradients": false,
+      "gradients": []
+    },
     "layout": {
       "contentSize": "660px"
     },