feat: single-page redesign with text-only hero, team section, services grid, mobile nav

- Replace component-based index with unified inline page
- Add text-only hero with warm editorial typography
- Add team section with avatars and bios
- Convert services to responsive grid layout
- Add contact labels and editorial images
- Implement mobile hamburger navigation with slide-in panel
- Polish typography, spacing, and accessibility
- Remove design variant pages (1-6)

src/components/sections/Trust.astro

@@ -0,0 +1,14 @@
+---
+import { siteContent } from "@/content/site-content"
+---
+
+<section class="trust-band" aria-labelledby="trust-title">
+  <div>
+    <p class="eyebrow">Lokales Vertrauen</p>
+    <h2 id="trust-title">{siteContent.reviewSummary.rating}</h2>
+  </div>
+  <p class="trust-copy">
+    <strong>{siteContent.reviewSummary.count}</strong>
+    <span>{siteContent.reviewSummary.text}</span>
+  </p>
+</section>