add direct link to Python API

Author: inariksit

index.html

@@ -72,8 +72,12 @@ <h3>Develop</h3>
       <li><a href="doc/gf-developers.html">Developers Guide</a></li>
       <!-- <li><a href="/~hallgren/gf-experiment/browse/">Browse Source Code</a></li> -->
       <li>PGF library API:<br>
-        <a href="http://hackage.haskell.org/package/gf/docs/PGF.html">Haskell</a> /
-        <a href="doc/runtime-api.html">C&nbsp;runtime</a>
+        <ul>
+          <li><a href="http://hackage.haskell.org/package/gf/docs/PGF.html">Haskell</a>
+          </li><li><a href="doc/runtime-api.html#python">Python</a>
+          </li><li><a href="doc/runtime-api.html">C&nbsp;runtime</a>
+          </li>
+        </ul>
       </li>
       <li><a href="http://hackage.haskell.org/package/gf/docs/GF.html">GF compiler API</a></li>
       <!-- <li><a href="src/ui/android/README">GF on Android (new)</a></li>