Remove tooling section

Removes tooling section. This section is being added to the GitLab Design project: gitlab-org/gitlab-design!24 (merged)

See discussion: https://gitlab.com/gitlab-org/design.gitlab.com/merge_requests/16/diffs?diff_id=10682237#966d8a28cc2e2c28093910538e17591761814f2d_5_20