Docs: add Boost Rules documentation

[novavolcanic]

Closes #12

What changed

• Added a Boost rules section to docs/administration/projects.md (after Search filters), documenting the BoostRule model fields: pattern (regex matched against full URLs), boost_score (additive float), and tie-breaking behavior (longest match wins).
• Added a cross-reference paragraph in docs/customization/search.mdx under "Boost search results" pointing to the dashboard boost rules as an alternative to per-page meta tags.

Source of truth

• biel/apps/projects/models.py:197–217 — BoostRule model (active, pattern, boost_score, position, project)
• biel/apps/projects/forms.py:430–460 — form exposes pattern and boost_score only
• biel/apps/projects/views/views.py:339–340 — gated behind boost.enabled team permission
• biel/apps/projects/parsers/url_parser.py:1619–1638 — longest-match wins; returns 0.0 if no match
• biel/apps/projects/parsers/url_parser.py:1421 — rule score adds to page-level biel:boost_score

Verification

• Code examples match actual API/props
• Internal links verified
• Follows Google developer documentation style guide

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 15e3eeab-644f-4d3b-81f2-9dce3a447a0f

📥 Commits

Reviewing files that changed from the base of the PR and between 39a5251 and fe5a7b7.

📒 Files selected for processing (2)

• docs/administration/projects.md
• docs/customization/search.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-boost-rules

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