Bug 539022 - [Releng] Update Papyrus web-page

* Do not forget to push the rcp under 2018-09/4.1.0
* Do not forget to add composites to updates/releases/2018-09
* Do not forget to publish (unhide) the 4.1.0 release and drops
repositories

Change-Id: I3157660e9ff93395ad562a16a47c7ef21bc5457a
Signed-off-by: Pauline DEVILLE <pauline.deville@cea.fr>