Docs IA follow-up: remove Contributing from the public sidebar and keep docs reader-focused

[justin808]

Summary

Recent docs work substantially improved the docs IA:

• source-owned sidebar landed in (Add docs/sidebars.ts for source-owned TOC navigation #2886)
• follow-up sidebar fixes landed in Fix sidebar navigation issues from #2886 review #2892
• onboarding noise was reduced in
• release notes were collapsed into archive pages
• Building Features is now grouped instead of fully flat
• RSC now lives under

However, the public docs sidebar still includes a top-level section with , , , , plus nested .

That content is valid, but it is still not part of the main reader journey for users trying to learn or use React on Rails.

Current problem

The main docs navigation is still carrying contributor/secondary material in the primary path:

• remains a top-level sidebar section
• remains nested inside it
• this leaves the docs with one more public-facing top-level section than needed
• it keeps philosophy/maintenance/reference-adjacent material mixed into the product docs journey

Goal

Keep the main docs sidebar focused on product learning, implementation, deployment, and upgrading.

Acceptance criteria

• Remove the top-level section from the primary docs sidebar
• Remove from the primary docs sidebar
• Keep the underlying pages published and reachable through secondary links or a contributor-oriented route
• Ensure , , , , , and still have at least one intentional inbound link
• Confirm the main docs sidebar is reader-focused and no longer presents contributor-oriented material as a top-level docs section

Out of scope

• URL changes
• route redirects
• machine-readable/agent docs

Related

• Meta: Documentation Overhaul — Consolidation, Cleanup, and Modernization #2678
• Follow-up: require sidebar updates when adding docs (agent docs + CI guard) #2889
• (Simplify docs navigation to reduce onboarding noise)

[justin808]

This was already addressed by PR #3064 (merged 2026-04-04), which removed the Contributing section from the docs sidebar and added inbound links to all 6 misc pages from introduction.md.

All acceptance criteria are met:

• Contributing section removed from sidebar
• Code Style removed from sidebar
• Pages remain published and reachable via introduction.md links
• All 6 pages (doctrine, style, updating-dependencies, credits, articles, tips) have intentional inbound links
• Sidebar is reader-focused with no contributor material