Merge pull request #34 from jklymak/doc-link-cheatsheets

DOC: point cheatsheets to cheatsheets site versus github

Author: QuLogic

docs/body.html

@@ -100,7 +100,7 @@ <h1>Matplotlib: Visualization with Python</h1>
             </a>
           </li>
           <li>
-            <a href="https://github.com/matplotlib/cheatsheets#cheatsheets">
+            <a href="https://matplotlib.org/cheatsheets/">
               <img
                 src="_static/images/cheatsheets.png"
                 alt="cheatsheet icon"