Merge branch 'remove-wiki-scss' into 'master'

Remove unnecessary wiki css

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/156326



Merged-by: Himanshu Kapoor <info@fleon.org>
Approved-by: Himanshu Kapoor <info@fleon.org>
Reviewed-by: Himanshu Kapoor <info@fleon.org>
Co-authored-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>