Update README to simplify image display

Removed old image table and replaced with a single centered image.

Author: Sunrisepeak

README.md

@@ -15,16 +15,9 @@
 | [Package index mcpp-index](https://mcpplibs.github.io/mcpp-index/) · [Module libraries mcpplibs](https://github.com/mcpplibs) · [Community Forum](https://forum.d2learn.org/category/20) · [Issues](https://github.com/mcpp-community/mcpp/issues) · [Releases](https://github.com/mcpp-community/mcpp/releases) |
 | Plugins · [mcpp-language-server (mcppls)](https://github.com/Sunrisepeak/mcpp-language-server) — a C++20/23 modules language server |
 
-<table>
-  <tr>
-    <td align="center" width="50%">
-      <img src="https://github.com/user-attachments/assets/3778c1d6-9341-43b0-b344-1d0943ec7d2a" alt="mcpp demo 2" width="460">
-    </td>
-    <td align="center" width="50%">
-      <img src="https://github.com/user-attachments/assets/6c85896e-9a37-4f62-acfb-d37a4eae2363" alt="mcpp demo 1" width="460">
-    </td>
-  </tr>
-</table>
+<p align="center">
+  <img src="https://github.com/user-attachments/assets/3778c1d6-9341-43b0-b344-1d0943ec7d2a" alt="mcpp demo" width="720">
+</p>
 
 ## Highlights