[Chore] Notebook fixes

[Xmaster6y]

What does this PR do?

Key insights about the PR.

Linked Issues

• Closes #?
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Checklist

• I have read the CONTRIBUTING guide.
• I have added tests for my changes if needed.
• I have updated the documentation if needed.

---

Summary by cubic

Fixes citation rendering in the chess and concept attribution notebooks by switching to and moves the bibliography to a new References page. Cleans docs navigation by removing the About page and dead references and updating the sidebar/index; no analysis logic changes.

^{Written for commit 0720cc2. Summary will update on new commits.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.19%. Comparing base (ac66700) to head (0720cc2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   97.19%   97.19%           
=======================================
  Files          39       39           
  Lines        2426     2426           
=======================================
  Hits         2358     2358           
  Misses         68       68           

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Auto-approved: Documentation-only changes to tutorial notebooks to fix citation rendering. No source code or core logic is affected.}

[cubic-dev-ai]

1 issue found across 7 files (changes from recent commits).

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="docs/source/tutorials.rst">

<violation number="1" location="docs/source/tutorials.rst:116">
P1: This toctree entry references a notebook that is not in the repo, so the new tutorial link points to a non-existent page.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

_{Auto-approved: Purely documentation and notebook citation formatting changes with no impact on source code or logic.}