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>

services/commercial/index.html

@@ -20,7 +20,7 @@
                 <span class="hero-eyebrow"><i class="fas fa-map-marker-alt"></i> Waterloo, Seneca Falls &amp; the Finger Lakes</span>
                 <h1>Commercial Carpet Cleaning in Waterloo, NY</h1>
                 <p>Your business floors see heavy traffic every day. We restore them without disrupting your operations.</p>
-                <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>
             </div>
         </div>
     </section>
@@ -65,7 +65,7 @@
                     <h2>Local Knowledge. Professional Results.</h2>
                     <p>We have served the Waterloo and Finger Lakes commercial market for years. We understand the seasonal pace of this region and the demands placed on properties serving wine country visitors, year-round residents, and business clients alike.</p>
                     <p>Every job uses professional hot water extraction equipment. No rental-grade machines, no shortcuts. You get clean carpets the first time, with a before and after walk-through so you know exactly what was done.</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>
                 <div class="why-choose-image" style="background-image: url('/assets/images/hero/hero-commercial.webp')"></div>
             </div>
@@ -78,7 +78,7 @@
                 <h2>Ready to Protect Your Business Image?</h2>
                 <p>Call or book online and we will schedule around your hours.</p>
                 <div class="cta-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>