Update index.md

Removed link to old spreadsheet.

Author: jonathan-ullman

pages/how_to_use_the_repository/index.md

@@ -8,7 +8,7 @@ permalink: /how_to_use_the_repository/
 
 ## How to Use the Repository
 
-Each row in the [repository spreadsheet](https://docs.google.com/spreadsheets/d/1yG-B58i29vz0xp-yKjFPy1yj6fchGfp4keASS-zXdq8/edit#gid=0) corresponds to a published research paper describing an *output privacy attack*.  
+Each row in the repository corresponds to a published research paper describing an *output privacy attack*.  
 Before diving into the column definitions, it is helpful to begin with a concrete example.
 
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