Upgrade to Debian 10 and Node 10

Summary:
Recent Etherpad version requires Node 10.x.

This change also refreshes the Debian version.

Furthermore, we don't deploy anymore development packages,
to speed up the server.

Ref T1629

Test Plan: Tested on docker-001

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1629

Differential Revision: https://devcentral.nasqueron.org/D2315