Update README.md

bootstrap/README.md

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 Gradient Able Admin Template made using Bootstrap 4 framework, It is a free lite version of [Gradient Able Premium Admin Template](https://codedthemes.com/item/gradient-able-bootstrap-lite/) that makes you fulfill your entire Dashboard needs.
 
-![Gradient Able Free Admin Template preview image](https://codedthemes.com/wp-content/uploads/edd/2019/08/gradient-able.jpg)
+![https://org-public-assets.s3.us-west-2.amazonaws.com/Free-Version-Banners/GITHUB-FREE-BOOTSTRAP-REPO-Gradient+Able.jpg)
 
 Gradient Able admin template comes with variety of Bootstrap components like Button, Badges, Tabs, Breadcrumb, Icons, Form elements, Table, Charts & authentication pages.
 
@@ -124,4 +124,4 @@ Please generate Github issue if you found any bug in any version. We are try to
  - [Free React Dashboard Template](https://codedthemes.com/item/category/free-templates/free-react-admin-templates)
  - [Free Angular Dashboard Template](https://codedthemes.com/item/category/free-templates/free-angular-admin-templates)
  - [Premium Bootstrap & Angular Admin Template](https://codedthemes.com/item/category/templates/admin-templates/)
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