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>

service-area/index.html

@@ -20,7 +20,7 @@
                 <span class="hero-eyebrow">Seneca, Ontario, Schuyler &amp; Yates Counties</span>
                 <h1>Our <span class="text-accent">Service Area</span></h1>
                 <p>Professional carpet and upholstery cleaning throughout the Finger Lakes region.</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>
@@ -139,7 +139,7 @@
             <p style="color:rgba(255,255,255,0.8);font-size:1.05rem;line-height:1.8;margin-bottom:32px;">Our coverage area continues to grow. If your address is not listed above, give us a call. We will let you know whether we can reach you and when we have availability.</p>
             <div style="display:flex;gap:16px;justify-content:center;flex-wrap:wrap;">
                 <a href="tel:315-719-1218" class="btn btn-primary"><i class="fas fa-phone"></i> 315-719-1218</a>
-                <a href="/contact/" class="btn btn-ghost">Book Now</a>
+                <a href="https://bookedin.com/book/lahr-carpet-cleaning-and-upholstery" target="_blank" rel="noopener noreferrer" class="btn btn-ghost">Book Now</a>
             </div>
         </div>
     </section>
@@ -148,7 +148,7 @@
         <div class="cta-content">
             <h2 class="heading-4"><strong>Ready to Schedule Your </strong><span class="text-accent"><strong>Cleaning</strong></span><strong>?</strong></h2>
             <p class="paragraph-4">We serve your neighborhood. Free estimates available on every appointment.</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>