Füge Navigation und umfassende SEO-Optimierung hinzu

- Sticky Navigation mit Logo und Menü-Links
- Mobile Hamburger-Menü mit Smooth Scroll
- Back-to-Top Button mit Scroll-Effekt
- Umfassende SEO Meta-Tags (Keywords, Description, Geo)
- Open Graph und Twitter Card Tags für Social Media
- Schema.org strukturierte Daten (InsuranceAgency, Person)
- robots.txt und sitemap.xml für Suchmaschinen
- Canonical URLs auf allen Seiten
- Local SEO Optimierung für Kallmünz/Regensburg

script.js

@@ -1,3 +1,37 @@
+// Mobile Navigation Toggle
+const navToggle = document.getElementById('navToggle');
+const navMenu = document.getElementById('navMenu');
+const navLinks = document.querySelectorAll('.nav-link');
+
+navToggle.addEventListener('click', () => {
+    navToggle.classList.toggle('active');
+    navMenu.classList.toggle('active');
+});
+
+// Close mobile menu when clicking on a link
+navLinks.forEach(link => {
+    link.addEventListener('click', () => {
+        navToggle.classList.remove('active');
+        navMenu.classList.remove('active');
+    });
+});
+
+// Navbar scroll effect
+const navbar = document.getElementById('navbar');
+let lastScroll = 0;
+
+window.addEventListener('scroll', () => {
+    const currentScroll = window.pageYOffset;
+    
+    if (currentScroll > 50) {
+        navbar.classList.add('scrolled');
+    } else {
+        navbar.classList.remove('scrolled');
+    }
+    
+    lastScroll = currentScroll;
+});
+
 // Smooth scrolling for anchor links
 document.querySelectorAll('a[href^="#"]').forEach(anchor => {
     anchor.addEventListener('click', function (e) {
@@ -12,6 +46,24 @@ document.querySelectorAll('a[href^="#"]').forEach(anchor => {
     });
 });
 
+// Back to Top Button
+const backToTopButton = document.getElementById('backToTop');
+
+window.addEventListener('scroll', () => {
+    if (window.pageYOffset > 300) {
+        backToTopButton.classList.add('visible');
+    } else {
+        backToTopButton.classList.remove('visible');
+    }
+});
+
+backToTopButton.addEventListener('click', () => {
+    window.scrollTo({
+        top: 0,
+        behavior: 'smooth'
+    });
+});
+
 // Add animation on scroll
 const observerOptions = {
     threshold: 0.1,