Update index.md

Author: NetrunnerCodex

docs/advanced/index.md

@@ -1,7 +1,7 @@
 ---
 title: Advanced Concepts
 slug_title: Advanced Concepts
-slug_subtitle:
+slug_subtitle: This section describes many of the game’s advanced concepts
 slug_image: "/assets/images/slugs/adn44_preview1.jpg"
 layout: home
 has_children: true
@@ -19,8 +19,6 @@ nav_order: 30
 
 {: .no_toc }
 
-This section describes many of the game’s advanced concepts.
-
 <div class="nav-buttons">
   <!-- Previous Button -->
   <a href="/docs/introduction/run_example" class="nav-button" aria-label="Previous page">