chore: Change banner

Author: zharinov

.github/plotnik_banner.png

@@ -5,7 +5,7 @@
   <ul>
   <summary>
     <p align="center">
-      <img width="256" height="256" alt="logo" src="https://github.com/user-attachments/assets/2a93f290-a758-4b19-a38e-3f12b61743d7" />
+      <img width="400" alt="Plotnik banner" src=".github/plotnik_banner.png" />
     </p>
     <h1><p>plotnik</p></h1>  
   </summary>
@@ -26,9 +26,9 @@
   <a href="LICENSE.md"><img src="https://img.shields.io/badge/license-MIT-blue.svg" alt="MIT License"></a>
 </p>
 
-<br/>
 <br/>
 <hr/>
+<br/>
 
 ## Example