fix: move logo into docs/ to fix GitHub Pages image path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: yibie

docs/icon.png

@@ -214,7 +214,7 @@
 
 <nav>
   <a class="nav-logo" href="#">
-    <img src="../SkillsManager_Logo.png" alt="Skills Manager">
+    <img src="icon.png" alt="Skills Manager">
     Skills Manager
   </a>
   <div class="nav-links">
@@ -224,7 +224,7 @@
 </nav>
 
 <section class="hero">
-  <img class="hero-icon" src="../SkillsManager_Logo.png" alt="Skills Manager icon">
+  <img class="hero-icon" src="icon.png" alt="Skills Manager icon">
   <h1>One place for all your agent skills</h1>
   <p class="hero-sub">Discover, install, and manage skills across Claude Code, Cursor, Copilot CLI, Codex, Gemini CLI — from a single native macOS app.</p>
   <div class="hero-actions">