maint: Update "How to compile on Linux" link.

Change-Id: I97d6a8bd2cda6f960102030a553a6a8743acf80e
Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>
Tuleap: #1190

README

@@ -79,7 +79,7 @@ make install
 Done !
 
 More details available here:
-https://tuleap.ring.cx/wiki/index.php?pagename=How%20To%20Build%20Ring&group_id=101
+https://tuleap.ring.cx/plugins/mediawiki/wiki/ring/index.php/Build_Instructions
 
 
 How to compile on OSX