Merge branch 'sselhorn-master-patch-49299' into 'master'

Adding Getting started to top-level page

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/152676



Merged-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Suzanne Selhorn <sselhorn@gitlab.com>