Render each guideline as a standalone page

[PLeVasseur]

Summary

• Replace guideline include files with standalone guideline pages and chapter toctrees
• Update guideline tooling and scans to handle .rst pages directly
• Fix linkcheck flag behavior and a bibliography URL used in validation

Testing

• uv run ruff check --fix
• uv run python generate_guideline_templates.py --number-of-templates 1
• gh issue view 135 --repo rustfoundation/safety-critical-rust-coding-guidelines --json number,title,body | uv run python scripts/guideline-from-issue.py
• gh issue view 135 --repo rustfoundation/safety-critical-rust-coding-guidelines --json number,title,body | uv run python scripts/generate-rst-comment.py
• uv run python scripts/split_guidelines.py --dry-run --all --update-index
• uv run python scripts/migrate_rust_examples.py --dry-run
• uv run python scripts/extract_rust_examples.py --extract
• uv run python scripts/extract_rust_examples.py --test
• uv run python scripts/fls_audit.py --summary-only
• uv run pytest
• uv run python make.py
• uv run python make.py --xml
• uv run python make.py --debug
• uv run python make.py --offline
• uv run python make.py --ignore-spec-lock-diff
• uv run python make.py --check-links
• uv run python make.py --validate-urls
• timeout 5s uv run python make.py --serve
• Manual audit: scripts/fls_audit_issue.py, scripts/reviewer_bot.py

Closes #284

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