demo: fix link in comment (#1581)

exampleSite/content/home/skills.md

@@ -12,7 +12,7 @@ subtitle = ""
 # 
 # Add/remove as many `[[feature]]` blocks below as you like.
 # 
-# For available icons, see: https://sourcethemes.com/academic/docs/widgets/#icons
+# For available icons, see: https://sourcethemes.com/academic/docs/page-builder/#icons
 
 [[feature]]
   icon = "r-project"