fix: merge duplicate markdown_extensions keys in mkdocs.yml

[rmnvg]

Fix

Merged both blocks into a single `markdown_extensions` key, preserving the `pymdownx.superfences` mermaid config unchanged.

Verification

Built the docs with `mkdocs build` before and after the change and counted `headerlink" anchors in the output:

• Before: 0 permalink anchors site-wide
• After: 97 permalink anchors site-wide

Confirmed all 6 extensions (`abbr`, `admonition`, `attr_list`, `def_list`, `toc`, `pymdownx.superfences`) load correctly and the mermaid `custom_fences` config is preserved verbatim.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: d4186791-7a09-497a-87e8-dedbd35d1683

📥 Commits

Reviewing files that changed from the base of the PR and between 0dab99c and 736d671.

📒 Files selected for processing (1)

• mkdocs.yml

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

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📝 Walkthrough

Walkthrough

The MkDocs configuration moves the pymdownx.superfences Mermaid fence configuration into the existing markdown_extensions list. The configuration values remain unchanged. The duplicate top-level declaration is removed.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 736d6

The MkDocs configuration change is low risk and documentation builds confirm the Mermaid setup works as intended.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the merge of duplicate markdown_extensions keys, preservation of the Mermaid configuration, and verification results.
Title check	✅ Passed	The title clearly and concisely identifies the main change: merging duplicate markdown_extensions keys in mkdocs.yml.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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