Update index.html image source

Author: cweitat

Diff for: index.html

@@ -95,7 +95,7 @@
 				var slide = pptx.addNewSlide();
 				slide.back ='CC0000';
 				slide.color = 'FFFFFF';
-				slide.addImage({ path:'C:/Users/user/Desktop/fossasia.png', x:1, y:1, w:8.0, h:4.0 });
+				slide.addImage({ path:'https://github.com/fossasia/fossasia-artwork/blob/master/Logo/Rectangle/png/fossasia-white-300dpi.png?raw=true', x:1, y:1, w:8.0, h:4.0 });
 				slide.addText([
 					{text:title, options:{bold:true, fontSize: 28, align:'c'}},
 					{text:displaytime, options:{bold:true, fontSize: 28, align:'c'}},