Update SUMMARY.md

Author: Sam Alarie

SUMMARY.md

@@ -8,5 +8,9 @@
   * [👩‍💻 Basic Usage](udroid-landing/basic-usage.md)
   * [🖥️ Display](udroid-landing/setting-up-gui.md)
   * [🔉 Audio](udroid-landing/setting-up-sound.md)
+  * [📺 Hardware Acceleration](udroid-landing/hardware-acceleration.md)
 * [👩🏻‍🔧 Tips & Tricks](udroid-landing/tips-&-tricks.md)
   * [🦊 Fixing Firefox Sound](udroid-landing/fixing-firefox-sound.md)
+  * [🎮 Playing Games](udroid-landing/playing-games.md)
+* [💳 Credits](udroid-landing/credits.md)
+  * [💀 The End](udroid-landing/the-end.md)