feat(docs): add custom docs 404 page

[almeidazs]

This adds a docs-specific 404 page so missing routes under /docs no longer fall back to the generic site-wide not found screen.

I kept it inside the docs layout and reused the existing empty-state components, with quick links back to /docs/get-started and /.

Validation:

• bun run typecheck in apps/web
• env RESEND_API_KEY=dummy bun run build in apps/web

Closes #70

Summary by CodeRabbit

• New Features
  • Added a styled documentation not-found page with navigation buttons to the getting started guide and home, plus a helpful note guiding users to use the sidebar or search functionality.

[vercel]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 48e1eedb-8382-4e90-a810-32a349c20e2a

📥 Commits

Reviewing files that changed from the base of the PR and between 55a0bda and 409da27.

📒 Files selected for processing (1)

• apps/web/src/app/docs/not-found.tsx

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📝 Walkthrough

Walkthrough

New 404 page component added to the docs section that displays a styled "page not found" UI with navigation buttons linking back to the docs get-started guide and home page, plus a helper note encouraging users to use sidebar/search.

Changes

Docs 404 Page

Layer / File(s)	Summary
DocsNotFound page component apps/web/src/app/docs/not-found.tsx	New page component with imports, Empty UI presentation (icon, title, explanatory text), two navigation buttons (/docs/get-started and /), and a small instructional note with ArrowLeft icon.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related issues

• None additional (issue #70 is already linked to this PR and directly addressed by this change).

Poem

🐰 A page not found, but fear not, dear friend,
The docs now guide you round the bend,
With buttons bright and arrows true,
Back to start, or home, it's up to you! 📖✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(docs): add custom docs 404 page' is clear, specific, and directly summarizes the main change of adding a custom 404 page for the docs section.
Linked Issues check	✅ Passed	The PR successfully implements the custom 404 page for the /docs route as required by issue #70, with proper component creation and navigation links.
Out of Scope Changes check	✅ Passed	All changes are directly related to implementing the docs-specific 404 page; no out-of-scope modifications detected.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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