Update links to removed how-to-guides anchors (#how-to-index-techdocs-documents
and #how-to-limit-what-can-be-searched-in-the-software-catalog) to point to the
existing #how-to-customize-fields-in-the-software-catalog-or-techdocs-index
anchor instead. Also update the old frontend system guide to link to the
--old variants of how-to-guides.
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor
Patrik Oldsberg
fb571af4ee