Update index.html

Header section dark mode text removed

Author: vimal-java-dev

index.html

@@ -12,7 +12,7 @@
   <header>
     <h1>Vimal Tech</h1>
     <p>Java Developer | Backend Engineer</p>
-    <button id="darkModeToggle">🌙 Dark Mode</button>
+    <button id="darkModeToggle">🌙</button>
     <nav>
       <ul>
         <li><a href="#about">About</a></li>