FIX: remove icon

Author: mmcky

website/index.html

@@ -24,7 +24,7 @@ <h1><b>Dynamic Programming</b></h1>
             <a href="http://www.tomsargent.com/">Thomas J. Sargent</a> and <a href="http://johnstachurski.net/">John Stachurski</a>
         </div>
         <div class="amazon-link-container">
-            <a href="https://www.amazon.com/Dynamic-Programming-Finite-Thomas-Sargent/dp/1009540750/" class="amazon-button">📚 Buy on Amazon</a>
+            <a href="https://www.amazon.com/Dynamic-Programming-Finite-Thomas-Sargent/dp/1009540750/" class="amazon-button">Buy on Amazon</a>
         </div>
     </header>