rework: rewrite website copy, add full SEO/AEO optimization

- Rewrote all copy: removed AI slop, developer-gatekeeping phrasing
- New hero: 'Your hosts file, but better'
- Added comparison section (Locale vs editing /etc/hosts) for AEO
- Added visible FAQ section with 6 questions
- JSON-LD structured data: SoftwareApplication + FAQPage + Organization + WebSite
- Open Graph + Twitter Card meta tags
- Canonical URL, robots directive, author meta
- Title updated to 'Locale — DNS Context Switcher for macOS'
- Privacy section (no telemetry, no analytics, no account)
- Section labels updated: 'Safety model' → 'How DNS stays safe'
- 'Features' subtitle → 'One thing, done well'

Author: offyotto