What does this MR do?
New Group page to the design specified in #20827 (moved).
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Getting Started meta.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
Changelog entry added
API support added
Added for this feature/bug
All builds are passing
Conform by the merge request performance guides
Conform by the style guides
Branch has no merge conflicts with
master(if it does - rebase it please)
Squashed related commits together
What are the relevant issue numbers?
Closes #20827 (moved)