Group together the group API pages

Achilleas Pipinellisrequested to merge
axil-group-api-groups into main

While working on gitlab!162769 (merged), I noticed that we have a lot of group-related pages as top-level API pages. This MR aims to group the group-related pages under the same item.

before after
Screenshot_2024-08-22_at_00.12.41 Screenshot_2024-08-22_at_00.11.59
Edited by Achilleas Pipinellis

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