Update navigation structure for Project and Group integrations documentation
What does this MR do and why?
Updated documentation navigation to add a new entry for Group integrations and renamed the existing Integrations API section to "Project integrations" for better clarity.
This change supports the new group-level integrations feature (issue gitlab#328496 (closed)_) which allows managing integrations at the group level, complementing the existing project-level functionality._
RFC: gitlab!179694 (comment 2343506716)
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