Following the recent reorganisation of the documentation in 12.0+,
the majority of the documents have been moved and their old links are no longer valid.
Some redirection rules will soon be deployed, but those rules might be dropped in some years
and we want the links to still work, which is why we still replace the links to the new ones.

FW-Port of odoo/odoo#70675 (13.0)

closes odoo/odoo#70920

X-original-commit: bc9c1eef538ba6095e74c19d5d9ed9e01625ec7c
Related: odoo/enterprise#18361
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>