Update documentation link

Author: QuLogic

README.rst

@@ -5,7 +5,7 @@ data_prototype
 Experimental code for the upcoming Matplotlib data refactor.
 
 * Free software: 3-clause BSD license
-* Documentation: https://tacaswell.github.io/data-prototype.
+* Documentation: https://matplotlib.org/data-prototype
 
 Features
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