Use table layout for README title icon alignment

Replace inline H1 image markup with a small HTML table and valign middle cells so the rocket icon and Docking title stay visually aligned in GitHub rendering.

Author: edumucelli

README.md

@@ -1,4 +1,9 @@
-# Docking <img src="images/docking-header.png" alt="Docking" height="52" style="vertical-align: -1.30em;">
+<table>
+  <tr>
+    <td valign="middle"><h1>Docking</h1></td>
+    <td valign="middle"><img src="images/docking-header.png" alt="Docking" height="52"></td>
+  </tr>
+</table>
 
 A lightweight, feature-rich dock for Linux written in Python with GTK 3 and Cairo. Inspired by [Plank](https://launchpad.net/plank) and [Cairo-Dock](https://github.com/Cairo-Dock), with an extensible applet system for custom widgets.