Switch links for pdf version documentation to on ReadTheDocs.

doc/_templates/index.html

@@ -62,11 +62,11 @@
   </table>
 
   <p>{%trans%}
-    You can also download PDF versions of the Sphinx documentation:
-    a <a href="http://sphinx-doc.org/sphinx.pdf">version</a> generated from
+    You can also download PDF/EPUB versions of the Sphinx documentation:
+    a <a href="http://readthedocs.org/projects/sphinx/downloads/pdf/stable/">PDF version</a> generated from
     the LaTeX Sphinx produces, and
-    a <a href="http://sphinx-doc.org/sphinx-rst2pdf.pdf">version</a> generated
-    by rst2pdf.{%endtrans%}
+    a <a href="http://readthedocs.org/projects/sphinx/downloads/epub/stable/">EPUB version</a>.
+   {%endtrans%}
   </p>
 
   <h2>{%trans%}Examples{%endtrans%}</h2>