[REM] odoo_sh: remove incorrect information about cups (#937)

CUPS the server will never be installed on an Odoo.sh machine.
That being said you can use a remote printer with a cups client.
The problem lays in the sorry state of libcups dependencies so we will
try to get a reliable section in the documentation for 20.04 as soon as
we can get a testcase.

Meanwhile, it has been reported that the command line `lp` cups cli
client tool could be used as a workaround in the OCA concerned module:

https://gist.github.com/rm-jamotion/0453e91ff3e13350a1e46a11ebb02e8d

Reapply of https://github.com/odoo/documentation-user/commit/3b4c795
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jev 2021-04-23 11:18:09 +02:00 committed by GitHub
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@ -31,15 +31,3 @@ We advise that:
`idempotent <https://stackoverflow.com/a/1077421/3332416>`_: they must not
cause side-effects if they are started more often than expected.
Can you install `pycups <https://pypi.org/project/pycups/>`_ or some similar library linked to `CUPS <https://www.cups.org/>`_ ?
--------------------------------------------------------------------------------------------------------------------------------
Several community apps for Odoo list ``pycups`` as required dependency.
- ``pycups`` is a set of Python bindings for the libcups library. They are meant to integrate your computer with a local printing server.
- CUPS is a printing server meant to be used for printers on the same local network as the Odoo server.
We consider adding new system packages as long as they are indeed used.
Regarding ``pycups``, you won't be able to configure a printer in the local network of your Odoo.sh server.