Remove screenshot from README

Removed Markdown Viewer screenshot from README.

Author: ThisIs-Developer

README.md

@@ -22,8 +22,6 @@
 
   <p>
     <a href="https://deepwiki.com/ThisIs-Developer/Markdown-Viewer"><img src="https://deepwiki.com/badge.svg" /></a>
-    <br />
-    <img src="https://github.com/user-attachments/assets/b41520d0-8560-445f-a889-5c755b5b8e2b" alt="Markdown Viewer screenshot" />
   </p>
 </div>