Add CODE (Collabora Online Development Edition) as Files plugin on Cloud

Currently it’s not possible to edit ODT files on Disroot Cloud, even less on a collaborative way.
Installing CODE solves this and lets users use ODT as a collaborative platform, just as Google Docs. Also CODE lets use other LibreOffice file formats.

It’s possible both to create files on Cloud or to upload it, on both cases being possible to edit and share it.