fix: Removed deprecated sugar-web library causing maintenance overhead (sugarlabs#4764)

* Removed deprecated sugar-web library

* Remove sugar-web library

Author: Anshumancanrock

css/activity.sass

@@ -55,7 +55,6 @@ input.number
     z-index: -1
 
 #canvas
-    // overwrite the definition in sugar-web/graphics/css/sugar.css
-    // to workaroud a bug affecting webkit on android 4.1/4.2
+    // overwrite the default definition to workaround a bug affecting webkit on android 4.1/4.2
     // https://code.google.com/p/android/issues/detail?id=41312
     overflow-y: visible