Hide LaunchDarkly feature flags page from navigation

[devin-ai-integration]

Hide LaunchDarkly feature flags page from navigation

Summary

Added hidden: true flag to the LaunchDarkly feature flags page entry in /fern/products/docs/docs.yml to remove it from the documentation navigation. The page content remains accessible via direct URL, but will no longer appear in the sidebar navigation.

Review & Testing Checklist for Human

• Verify the page is hidden: Check the preview deployment and confirm the "LaunchDarkly feature flags" page no longer appears in the "Analytics & integrations" section of the navigation
• Check for broken internal links: Search the docs for any links to /learn/docs/integrations/feature-flags or references to the LaunchDarkly page that might need updating
• Confirm intended behavior: Verify that hiding from navigation (vs completely removing) is the desired outcome - the page content will still be accessible if someone has a direct link

Notes

This change follows the existing pattern used for other hidden pages in the docs (see lines 115, 118, 215, 229 in the same file). The page file itself (./pages/integrations/feature-flags.mdx) remains unchanged.

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Link to Devin run: https://app.devin.ai/sessions/7c3c3bf2b85c445eaae99455ae3ed7e5
Requested by: Deep Singhvi (@dsinghvi)

[devin-ai-integration]

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