docs: update mobile UI section to use a table for screenshots

Author: dorlugasigal

README.md

@@ -17,13 +17,13 @@ https://github.com/user-attachments/assets/9dd4f3d7-f017-4314-9b3a-f6a5688e3671
 
 ### Mobile UI
 
-<p align="center">
-  <img src="docs/assets/screenshots/mobile-session-hub.jpeg" alt="Session hub on mobile" width="280" />
-  &nbsp;&nbsp;
-  <img src="docs/assets/screenshots/mobile-session-preview.jpeg" alt="Session preview on mobile" width="280" />
-  &nbsp;&nbsp;
-  <img src="docs/assets/screenshots/mobile-terminal.jpeg" alt="Terminal on mobile" width="280" />
-</p>
+<table align="center">
+  <tr>
+    <td align="center"><img src="docs/assets/screenshots/mobile-session-hub.jpeg" alt="Session hub on mobile" width="250" /></td>
+    <td align="center"><img src="docs/assets/screenshots/mobile-session-preview.jpeg" alt="Session preview on mobile" width="250" /></td>
+    <td align="center"><img src="docs/assets/screenshots/mobile-terminal.jpeg" alt="Terminal on mobile" width="250" /></td>
+  </tr>
+</table>
 
 ## Quick Start