SEO and performance optimization

[PetarStoev02]

Description

Optimize the public website for search engines and performance.

Scope

• Meta tags for all pages (title, description, OG images)
• Structured data (JSON-LD) for software project
• Sitemap generation
• Core Web Vitals optimization
• Image optimization (next/image)
• Analytics setup (privacy-friendly, e.g. Plausible)

[github-actions]

This issue has had no activity in 60 days. Flagging stale.
If it's still relevant, comment or add it to a due-dated milestone within 30 days, otherwise it will be auto-closed.