Merge branch 'update-persona-links' into 'master'

Update persona links to handbook subdomain

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142401



Merged-by: Suzanne Selhorn <sselhorn@gitlab.com>
Approved-by: Suzanne Selhorn <sselhorn@gitlab.com>
Co-authored-by: Katrin Leinweber <kleinweber@gitlab.com>