adding correct link to first python tutorial now pointing to python tutrial 1 as opposed to ruby tutorial 1

Author: matyikriszta

index.html

@@ -69,7 +69,7 @@ <h2>Ruby</h2>
           <h2>Python</h2>
 
           <ul>
-            <li><a href="ruby/lesson1/tutorial.html">Introduction to Python</a></li>
+            <li><a href="python/lesson1/tutorial.html">Introduction to Python</a></li>
           </ul>
           </section>
           <footer>