docs: convert search-boost into general Search config page

[skeptrunedev]

Summary

• Renames optimize/search-boost.mdx → optimize/search.mdx and restructures it so search boost is one section alongside a new Maximum search results section (for mint #7771).
• Adds light/dark screenshots of the new dashboard Search settings page at images/search-settings-{light,dark}.png (1534×1185, matched dimensions).
• Updates existing inbound links in changelog.mdx, organize/pages.mdx, and organize/settings-reference.mdx to deep-link into #boost-search-ranking.
• Adds a redirect /optimize/search-boost → /optimize/search.

Per repo conventions, translation files (zh/, fr/, es/, *.json language manifests) are intentionally untouched — the auto-translation pipeline picks those up after merge.

Test plan

• Preview deployment: /optimize/search renders with both sections and the screenshots swap correctly between light and dark themes
• /optimize/search-boost redirects to /optimize/search
• Deep-links from the changelog, organize/pages, and organize/settings-reference land on the boost section
• mint broken-links is clean

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Note

Low Risk
Low risk documentation-only change that updates navigation and adds a redirect; main risk is broken links or incorrect anchors if paths/ids don’t match.

Overview
Consolidates the standalone Search boost documentation into a new Search page (optimize/search.mdx) that keeps the boost guidance and adds a new section documenting the Maximum search results dashboard setting (with light/dark screenshots).

Updates site navigation (docs.json) and inbound links (e.g. changelog.mdx, organize/pages.mdx, organize/settings-reference.mdx) to point at optimize/search#boost-search-ranking, deletes optimize/search-boost.mdx, and adds a redirect from /optimize/search-boost to /optimize/search in redirects.json.

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