add cover image

Author: dellis1972

pdf/cover.md

@@ -22,7 +22,10 @@ html, body {
   justify-content: center;
   align-items: center;
   height: 100vh;
-  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
+  background-image: url('images/cover.png');
+  background-size: cover;
+  background-position: center;
+  background-repeat: no-repeat;
   color: white;
   text-align: center;
   font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
@@ -58,12 +61,7 @@ html, body {
 </style>
 
 <div class="cover-page">
-  <img src="../images/logo_light.svg" alt="MonoGame Logo" class="logo" />
   <div class="subtitle">Complete Reference Guide</div>
-  <div class="description">
-    One framework for creating powerful cross-platform games.
-    Build games for desktop, mobile, and consoles using C# and .NET.
-  </div>
   <div class="footer">
     Copyright © 2009-2026 MonoGame Foundation, Inc.
   </div>