www: add a direct link to download mpi_sync_clocks

public/index.html

@@ -126,6 +126,15 @@
 	More details are available on the
 	<a href="pm2/mpi_sync_clocks/doc/">MPI Sync Clocks documentation</a>.
       </p>
+      <p>
+	<b>&nbsp;&raquo;&nbsp;</b>
+	Download code on the
+	<a href="releases/#mpi_sync_clocks">release page</a>.
+      </p>
+      <p>
+        <b>&raquo;&nbsp;</b>MPI Sync Clocks source code is hosted as part of the
+        <a href="https://gitlab.inria.fr/pm2/pm2/">PM2 project on Inria Gitlab</a>.
+      </p>
 
 
       <h2>Legacy modules</h2>