fix: Remove redundant latest/ redirect prefix and deduplicate entry

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: louis-pre

.gitbook.yaml

@@ -4,7 +4,6 @@ root: ./docs/guides/
   readme: README.md
   summary: SUMMARY.md
 redirects:
-  latest/quickstart/get-api-key: quickstart.md
   quickstart/get-api-key: quickstart.md
   quickstart/installation: quickstart.md
   quickstart/authentication: quickstart.md