Deploy CMS's /libraries API

[rgaudin]

Not sure what it implies on CMS side, @benoit74 you may want to open tickets there but based on openzim/cms#131 and regarding Storage project, we need:

• UUID of the main Kiwix Catalog
• Working endpoint (https://api.cms.openzim.org/vX/libraries/{uuid}/catalog.xml I guess)
• This endpoint to serve production-ready data

[benoit74]

Following latest discussions on CMS, endpoint is going to move, probably to /vX/collections/{uuid}/catalog.xml, uuid being the UUID of Kiwix main collection. But this is mostly only a detail.