fix: replace dead pages-build-deployment badge

[tschm]

Problem

The weekly link check (run 32705080000) failed with a single lychee error:

[404] https://github.com/tschm/cs/actions/workflows/pages/pages-build-deployment (at 3:1) | Rejected status code: 404 Not Found

Cause

gh api repos/tschm/cs/pages reports "build_type": "workflow" — Pages is deployed by .github/workflows/rhiza_book.yml, not by the classic pages-build-deployment job. That workflow does not exist for this repo, so both the badge image and its link were dead.

Fix

Point the badge at the Book workflow instead. All URLs in README.md were then checked and return 200.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated the README book badge to link to the correct build workflow status.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 95f046ef-6b8f-4117-9234-12e5341ec08a

📥 Commits

Reviewing files that changed from the base of the PR and between cedbbac and 7e8b9fb.

📒 Files selected for processing (1)

• README.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The README book badge now links to and displays the status of the rhiza_book.yml GitHub Actions workflow instead of pages-build-deployment.

Changes

Book badge workflow

Layer / File(s)	Summary
Update book badge workflow reference README.md	The book status badge link and image URL now reference the rhiza_book.yml workflow.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 7e8b9

The README badge now points to the repository's active Book workflow instead of a dead Pages deployment endpoint; this is a localized documentation-only change with no actionable merge-blocking risk remaining.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: replacing the dead pages-build-deployment badge. It is concise and specific.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/readme-pages-badge

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