This switch will disable the docbuild and avoid installing its many dependencies (sphinx...).

In contrast to other packages, pplpy's docbuild is enabled unless explicitly disabled by setting SAGE_SPKG_INSTALL_DOCS=no. We move it to a separate package pplpy_doc and make it a dependency of sagemath_doc_html.

Split out from #31396.

We also add argon2_cffi and nbclient to the packages disabled upon --disable-notebook.

Depends on #29039

CC: @tobiasdiez @dimpase @jhpalmieri @sagetrac-tmonteil

Component: build: configure

Author: Matthias Koeppe, John Palmieri

Branch/Commit: 43221d0

Reviewer: John Palmieri, Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/32759