Fix a link typo for examples (#25)

Author: chekoopa

docs/_layouts/default.html

@@ -19,7 +19,7 @@ <h1><a href=/index class=project-name>flame</a></h1>
                                 </ul>
                                 <br>
                                 <ul>
-                                                <li><a href=https://github.com/easafe/purescript-flame/master/examples>Examples</a></li>
+                                                <li><a href=https://github.com/easafe/purescript-flame/tree/master/examples>Examples</a></li>
                                         <li><a href=/benchmarks>Benchmarks</a></li>
                                         <li><a href=https://pursuit.purescript.org/packages/purescript-flame>API Reference</a></li>
                                         <li><a href=https://github.com/easafe/purescript-flame>GitHub</a></li>
@@ -42,4 +42,4 @@ <h1><a href=/index class=project-name>flame</a></h1>
                                         }
                 </script>
         </body>
-</html>
+</html>