Remove Contributing section from docs sidebar (#3064)

## Summary
- Removes the top-level `Contributing` section (doctrine, style,
updating-dependencies, credits) and nested `Resources` (articles, tips)
from the primary docs sidebar
- Adds a Contributing section with links to all 6 pages at the bottom of
the introduction page, keeping them reachable
- All underlying pages remain published at their existing URLs

Fixes #2928

## Test plan
- [ ] Verify docs sidebar no longer shows Contributing or Resources
sections
- [ ] Verify introduction page has Contributing section with links to
all 6 pages
- [ ] Verify each linked page (`doctrine`, `style`,
`updating-dependencies`, `credits`, `articles`, `tips`) is accessible
via the introduction page links

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk documentation-only navigation change; main risk is
discoverability/regression in docs navigation if links/URLs are
misconfigured.
> 
> **Overview**
> Removes the **Contributing** (and nested **Resources**) section from
the Docusaurus `docsSidebar` so those pages no longer appear in the
primary navigation.
> 
> Adds a **Contributing** section to `docs/oss/introduction.md` with
direct links to the same six docs pages, keeping them accessible at
their existing URLs.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
2783ce5. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Reorganized contributing documentation navigation by moving the
"Contributing" section from the sidebar to the introduction page, with
direct links to related guides including Doctrine, Code Style, Updating
Dependencies, Credits, and Resources.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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

Author: justin808

docs/oss/introduction.md

@@ -136,6 +136,15 @@ Read the full **[React on Rails Doctrine](./misc/doctrine.md)** for our design p
 - **[React Documentation](https://react.dev)** - Official React documentation
 - **[Rails Guides](https://guides.rubyonrails.org)** - Ruby on Rails documentation
 
+## Contributing
+
+- **[React on Rails Doctrine](./misc/doctrine.md)** - Our design philosophy
+- **[Code Style](./misc/style.md)** - Coding style guidelines
+- **[Updating Dependencies](./misc/updating-dependencies.md)** - How to keep Ruby and JS dependencies current
+- **[Credits](./misc/credits.md)** - Authors and contributors
+- **[Articles, Videos, and Podcasts](./misc/articles.md)** - Community content
+- **[Tips](./misc/tips.md)** - Practical tips for working with React on Rails
+
 ---
 
 **Ready to start?** Pick your path above and let's build something great! 🚀

docs/sidebars.ts

@@ -5,6 +5,14 @@ import type { SidebarsConfig } from '@docusaurus/plugin-content-docs';
 // - building-features/rails-webpacker-react-integration-options
 // - deployment/troubleshooting-when-using-webpacker
 // - misc/asset-pipeline
+//
+// Contributing/Resources pages (linked from introduction.md instead of sidebar):
+// - misc/doctrine
+// - misc/style
+// - misc/updating-dependencies
+// - misc/credits
+// - misc/articles
+// - misc/tips
 
 const sidebars: SidebarsConfig = {
   docsSidebar: [
@@ -222,22 +230,6 @@ const sidebars: SidebarsConfig = {
         },
       ],
     },
-    {
-      type: 'category',
-      label: 'Contributing',
-      link: { type: 'generated-index', title: 'Contributing' },
-      items: [
-        'misc/doctrine',
-        'misc/style',
-        'misc/updating-dependencies',
-        'misc/credits',
-        {
-          type: 'category',
-          label: 'Resources',
-          items: ['misc/articles', 'misc/tips'],
-        },
-      ],
-    },
   ],
 };