Decide where should be gathered specs

Options:

as an article repository (in a .org)
on the wiki
as a spec section in the docs like for metadata/sparse deposits (https://docs.softwareheritage.org/devel/swh-deposit/specs/specs.html)
in a forge task

Migrated from T1683 (view on Phabricator)

Edited Jan 07, 2023 by Phabricator Migration user