Add stock photos throughout the site

- Hero: suburban house background with dark overlay
- Split section: house keys + CTA between Steps and Benefits
- Situations: house with yard as dark-overlay background
- Full-width break: neighborhood home between Testimonials and FAQ
- CTA banner: handshake background with dark overlay

All images from Unsplash (free, no attribution required).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/index.html

@@ -277,6 +277,16 @@
     </div>
   </section>
 
+  <!-- Image Break: Keys + CTA -->
+  <section class="image-break image-break--split">
+    <img src="/images/happy-keys.jpg" alt="House keys representing a successful home sale" class="image-break__img" width="800" height="601" loading="lazy">
+    <div class="image-break__text">
+      <h2>Your Keys to a Fresh Start</h2>
+      <p>Selling your house shouldn't be stressful. We handle everything — from paperwork to closing — so you can move on with peace of mind. No showings, no strangers walking through your home, no waiting months for a buyer.</p>
+      <a href="#lead-form-section" class="btn">Get My Cash Offer</a>
+    </div>
+  </section>
+
   <!-- Benefits -->
   <section class="section section--light benefits">
     <div class="container">
@@ -412,6 +422,11 @@
     </div>
   </section>
 
+  <!-- Image Break: Neighborhood -->
+  <section class="image-break">
+    <img src="/images/neighborhood.jpg" alt="Suburban home exterior in a family neighborhood" class="image-break__img" width="1400" height="937" loading="lazy">
+  </section>
+
   <!-- FAQ -->
   <section class="section section--light faq">
     <div class="container">