chore(starters): add gatsby-starter-builder (#22692)

* chore(starters): add gatsby-starter-builder

* address feedback

docs/starters.yml

@@ -5808,6 +5808,18 @@
     - Includes React Helmet
     - Clean minimalist design
     - Completely customizable using only gatsby-config.js file
+- url: https://builderio.github.io/gatsby-starter-builder/
+  repo: https://github.com/BuilderIO/gatsby-starter-builder
+  description: Gatsby starter with drag + drop page building with your React components via Builder.io
+  tags:
+    - CMS:Other
+    - CMS:Headless
+  features:
+    - Builder.io integration with sample pages/header/footer.
+    - Drag and drop page editing and creations.
+    - Lots of built-in templates, widgets, or bring in your own custom components.
+    - Uses @builder.io/gatsby plugin to dynamically create pages published on the editor.
+    - SEO
 - url: https://gatsby-starter-reason-blog.netlify.com/
   repo: https://github.com/mukul-rathi/gatsby-starter-reason-blog
   description: The Gatsby Starter Blog using ReasonML!