Updated _Sidebar (markdown)

_Sidebar.md

@@ -17,9 +17,6 @@
 * [Working for Android](Working-for-Android)
 * [Working for Web (HTML5)](Working-for-Web-(HTML5))
 
-## Installation
-* [Install on GNU Linux](Install-on-GNU-Linux)
-
 ## Misc Help
 * [How To: Using SpriteFonts](Using-SpriteFonts)
 * [How To: audio module as standalone library](Use-audio-module-as-standalone-library)