Sage's docbuilding uses optparse for argument parsing, but this library has been deprecated for a while. We should switch to argparse.

Some instructions for conversions can be found here: https://docs.python.org/3/library/argparse.html#help

Depends on #32946

Component: documentation

Author: Frédéric Chapoton

Branch/Commit: 0b62c16

Reviewer: John Palmieri

Issue created by migration from https://trac.sagemath.org/ticket/31366