chore: replace deprecated uslugify with configurable slugify

[bharvey88]

Summary

Replaces the deprecated pymdownx.slugs.uslugify reference in mkdocs.yml with the configurable pymdownx.slugs.slugify (case: lower). Eliminates the DeprecationWarning: 'uslugify' is deprecated warning seen in CloudCannon and CI build logs.

Why

pymdownx.slugs.uslugify was deprecated in pymdown-extensions in favor of the configurable slugify factory. The two are functionally identical when case: lower is set, so existing tab anchor URLs do not change.

Behavior change

None. uslugify was just slugify(case='lower') under the hood, so generated slugs and anchors are identical. Existing internal/external links to tab anchors continue to resolve.

Test plan

• Build runs without the 'uslugify' is deprecated warning
• A page with content tabs (e.g., the Setup pages with iPhone/Android tabs) still renders tabs correctly
• Tab anchor URLs unchanged (no broken bookmarks)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7b0fb487-eaeb-41e9-a00f-f8c65f89dc6c

📥 Commits

Reviewing files that changed from the base of the PR and between 66ea52d and 464a3c2.

📒 Files selected for processing (1)

• mkdocs.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dev

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