Add better looking prompt, like in social-post-explorers

README.md

@@ -7,6 +7,10 @@ sdk: static
 pinned: false
 ---
 
+<div style="background-color: rgb(255, 241, 209); color: rgb(90, 65, 0); border-radius: 8px; padding: 0.5rem 1rem; ">
+  <span style="font-weight: 600;">Want to publish Articles on Hugging Face?</span> Use the "Request to join this org" button to join the waitlist.
+</div>
+
 ![image/png](https://cdn-uploads.huggingface.co/production/uploads/6141a88b3a0ec78603c9e784/4_mKmOHYS8FQQd8biiEkD.png)
 
 # Blog Explorers