Renames optimize/search-boost.mdx to optimize/search.mdx and
restructures it so search boost is one section alongside the new
"Maximum search results" setting from mint #7771. Updates inbound
links (changelog, pages.mdx, settings-reference.mdx) to deep-link
into the boost section, adds a redirect from the old path, and
includes light/dark screenshots of the new dashboard settings page.
skeptrune