[josh-heyer]

The Docusaurus build's landing page was a hand-copied port of the Gatsby page, so new products (EDB Vector Plus most recently) never appeared on it. This moves the page's content into data so it can be generated.

• Each product's .registry.yaml gets a homepage: entry: either false, or a placement (group, optional section, label, subtitle, href, and a sparse order). New products now have to say whether they belong on the landing page.
• A new homepage.yaml at the repo root holds everything that isn't a product's root page: the banner, the groups and their sections, links to hub pages, deep pages and external sites, the "What's new" cards, and the footer links.
• The page's current layout and links are reproduced as they are today. The one addition is EDB Vector Plus, under Agentic AI after Agent Governance.

Gatsby's filesystem sources don't include the repo root, so homepage.yaml isn't published as content. This changes no docs content and no URLs.

Open question for reviewers: pg_textsearch is a registered extension that isn't on today's page. It's homepage: false for now; say if it should be listed under Extensions.

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