Ryan Malloy b892189f21 Add SEO infrastructure: sitemap, OG meta, JSON-LD, custom 404 ...

- Integrate @astrojs/sitemap for automatic sitemap generation
- Add robots.txt with sitemap reference
- Add Open Graph and Twitter Card meta tags to Layout
- Add canonical URL and structured data slot to Layout
- Add JSON-LD schema (WebSite, CollectionPage, Book, BreadcrumbList)
- Create custom 404 page with navigation links
- Create default OG image (SVG with graph-paper theme)
- Wire SITE_URL through Docker build args for production builds
- Update Caddyfile for proper 404 handling instead of SPA fallback

2026-02-13 07:32:57 -07:00

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