Update kiwix-serve in Ideascube
If I rely on http://kiwix.demo.ideascube.org/, it looks like Ideascube uses a quite old version of kiwix-serve. In Pibox installer and for Pibox installer users we definitly need the newest version. Kiwix publishes newer versions of Kiwix tools (which embeds kiwix-serve) here: http://kiwix.demo.ideascube.org/. Would be great to use it.