SEO & content optimization: meta tags, structured data, improved targeting

Major improvements:
- Add comprehensive meta tags (Open Graph, Twitter Cards, canonical URL)
- Implement schema.org structured data (Organization, FAQPage)
- Optimize H1 with keywords: "Non-profit registrator for .dk-domæner"
- Add robots.txt and sitemap.xml with Flask routes
- Improve hero intro with specific pain point (90-150 kr/year)
- Enhance DNSSEC description with technical details (DS-records)
- Update timeline to May 2026
- Add FAQ comparing PunktFri to commercial providers
- CSS styling for H1 subtitle

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

static/style.css

@@ -92,6 +92,15 @@ header nav {
     color: var(--primary);
 }
 
+.hero h1 .h1-subtitle {
+    font-size: clamp(1rem, 2.5vw, 1.3rem);
+    font-weight: 400;
+    color: var(--text);
+    display: block;
+    margin-top: 0.5rem;
+    letter-spacing: -0.01em;
+}
+
 .hero .tagline {
     font-size: clamp(1rem, 2.2vw, 1.2rem);
     color: var(--text);