web: point to gitlab repo

web/index.php

@@ -92,7 +92,7 @@ the OCaml Package Manager (OPAM).</p>
   </ol>
 </p>
 <p>The source code is also available from <a
-        href="http://heptagon.gforge.inria.fr">the Heptagon/BZR web page</a> for manual
+        href="https://gitlab.inria.fr/synchrone/heptagon">the Heptagon/BZR repository</a> for manual
       compilation and installation. Further indications about ReaX can
       be found on <a href="http://reatk.gforge.inria.fr">the ReaX/ReaTk
         page</a>.<br>

web/toc.php

@@ -8,6 +8,7 @@
 
   <ul>
     <li><a href="http://heptagon.gforge.inria.fr">Main page</a></li>
+    <li><a href="https://gitlab.inria.fr/synchrone/heptagon">Source code</a></li>
     <li><a href="https://gforge.inria.fr/frs/?group_id=2773">Download</a></li>
     <li><a href="pub/heptagon-manual.pdf">Manual</a></li>
     <li><a href="bib.php">Publications</a></li>