This email builder widget can help you re-create page based newsletters in Kentico 11.
To use this widget in your newsletters, first import the .zip file in the Sites module: Importing a site or objects. In step 3, ensure that Import code files and Import global folders are checked.
After the import, please re-sign all macros or re-save the Culture property on the widget's Properties tab. You can then assign the widget to an email template and use it in your newsletters!