fix(site): remove member-facing Models nav item (#28772) - #28781

Cherry-pick of 3d3b36f onto release/2.37 had conflicts.
To resolve:
  git fetch origin backport/28772-to-2.37
  git checkout backport/28772-to-2.37
  git cherry-pick -x -m1 3d3b36f
  # resolve conflicts
  git push origin backport/28772-to-2.37

(cherry picked from commit 3d3b36f)