Fix inforrect URL

Fixes #11

Author: rocky

index.html

@@ -138,7 +138,7 @@ <h3><a href="https://pypi.org/project/mathics-django/">Mathics-Django</a></h3>
             There is a browser-based webserver that has
 	    MathML-formatted formatted output using <a href="https://threejs.org/">three.js</a>
 	    graphics. The github repository is
-              <a href="https://github.com/Mathics/mathics-django">here</a>.
+              <a href="https://github.com/Mathics3/mathics-django">here</a>.
           </p>
 
           <p>