feat(README): update headlines feed description

- Remove outdated UI description
- Add information about in-feed messages and calls-to-action
- Improve clarity of the feature description

Author: fulleni

README.md

@@ -13,7 +13,7 @@ This app comes packed with all the features you need to launch a professional ne
 
 #### 📰 **Dynamic & Engaging Headlines Feed**
 *   Display news in a beautiful, performant, infinitely scrolling feed.
-*   Engage users with a polished and modern UI right out of the box.
+*   Strategically display in-feed messages to drive user actions. Show calls-to-action like 'Create an Account' to anonymous users or 'Upgrade to Premium' to authenticated users, all based on configurable rules.
 > **Your Advantage:** You get a production-quality feed system instantly. Skip the months of complex UI work and state management. ⏱️
 
 #### 🔍 **Advanced Content Filtering & Search**