feat: replace all booking CTAs with BookedIn scheduling link

Replace /contact/ booking links sitewide with the BookedIn external
scheduling URL (https://bookedin.com/book/lahr-carpet-cleaning-and-upholstery).
All "Book Now" and "Get a Free Estimate" buttons across 38 HTML pages now
open the BookedIn scheduler in a new tab. Added a "Book Online" CTA button
to the shared nav bar and a booking link in the footer (components.js).
The contact page retains its form as a secondary option, with a prominent
"Book Online Instantly" banner added above it.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

index.html

@@ -29,7 +29,7 @@
                 <h1 class="hero-title">Deeply<br>Clean<br><span class="text-accent">Carpets.</span></h1>
                 <p class="hero-sub">Professional carpet and upholstery cleaning for homes and businesses across Upstate New York.</p>
                 <div class="hero-actions">
-                    <a href="/contact/" class="btn btn-primary btn-large">Book Now</a>
+                    <a href="https://bookedin.com/book/lahr-carpet-cleaning-and-upholstery" target="_blank" rel="noopener noreferrer" class="btn btn-primary btn-large">Book Now</a>
                     <a href="tel:315-719-1218" class="btn btn-ghost btn-large"><i class="fas fa-phone"></i> 315-719-1218</a>
                 </div>
             </div>
@@ -52,7 +52,7 @@
                     </div>
                     <i class="fas fa-arrow-right cta-strip-arrow"></i>
                 </a>
-                <a href="/contact/" class="cta-strip-item cta-strip-primary">
+                <a href="https://bookedin.com/book/lahr-carpet-cleaning-and-upholstery" target="_blank" rel="noopener noreferrer" class="cta-strip-item cta-strip-primary">
                     <div class="cta-strip-icon"><i class="fas fa-calendar-check"></i></div>
                     <div class="cta-strip-text">
                         <span class="cta-strip-label">Book Now</span>
@@ -180,7 +180,7 @@
         <div class="cta-content">
             <h2 class="heading-4"><strong>Book Your </strong><span class="text-accent"><strong>Cleaning</strong></span><strong> Today!</strong></h2>
             <p class="paragraph-4">Get a free estimate for your home or business. We serve Waterloo, Geneva, and the Finger Lakes region.</p>
-            <a href="/contact/" class="btn btn-primary">Book Now</a>
+            <a href="https://bookedin.com/book/lahr-carpet-cleaning-and-upholstery" target="_blank" rel="noopener noreferrer" class="btn btn-primary">Book Now</a>
         </div>
     </section>