Enhance SEO and performance for MC Cars website

- Added meta tags for SEO optimization across multiple pages including descriptions, robots directives, and Open Graph tags.
- Implemented JSON-LD structured data for better search visibility and rich snippets.
- Configured nginx for improved performance with gzip compression, caching strategies, and security headers.
- Created robots.txt and sitemap.xml for better search engine indexing and crawl management.
- Developed comprehensive SEO documentation including a guide and quick reference for ongoing optimization efforts.

frontend/sitemap.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
+        xmlns:xhtml="http://www.w3.org/1999/xhtml"
+        xmlns:mobile="http://www.google.com/schemas/sitemap-mobile/1.0"
+        xmlns:news="http://www.google.com/schemas/sitemap-news/0.9"
+        xmlns:image="http://www.google.com/schemas/sitemap-image/1.1"
+        xmlns:video="http://www.google.com/schemas/sitemap-video/1.1">
+    
+    <!-- Main homepage - highest priority -->
+    <url>
+        <loc>https://demo.lago.dev/</loc>
+        <lastmod>2026-05-09</lastmod>
+        <changefreq>weekly</changefreq>
+        <priority>1.0</priority>
+        <xhtml:link rel="alternate" hreflang="de" href="https://demo.lago.dev/"/>
+        <xhtml:link rel="alternate" hreflang="en" href="https://demo.lago.dev/en/"/>
+        <xhtml:link rel="alternate" hreflang="x-default" href="https://demo.lago.dev/"/>
+    </url>
+    
+    <!-- Legal pages -->
+    <url>
+        <loc>https://demo.lago.dev/agb.html</loc>
+        <lastmod>2026-05-09</lastmod>
+        <changefreq>monthly</changefreq>
+        <priority>0.6</priority>
+    </url>
+    
+    <url>
+        <loc>https://demo.lago.dev/datenschutz.html</loc>
+        <lastmod>2026-05-09</lastmod>
+        <changefreq>monthly</changefreq>
+        <priority>0.6</priority>
+    </url>
+    
+    <url>
+        <loc>https://demo.lago.dev/impressum.html</loc>
+        <lastmod>2026-05-09</lastmod>
+        <changefreq>monthly</changefreq>
+        <priority>0.6</priority>
+    </url>
+    
+    <url>
+        <loc>https://demo.lago.dev/mietbedingungen.html</loc>
+        <lastmod>2026-05-09</lastmod>
+        <changefreq>monthly</changefreq>
+        <priority>0.7</priority>
+    </url>
+    
+</urlset>