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>

locations/phelps-ny/index.html

@@ -20,7 +20,7 @@
                 <h1 class="hero-title">Phelps,<br><span class="text-accent">NY</span></h1>
                 <p>Residential carpet and upholstery cleaning throughout Phelps.</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>
@@ -85,7 +85,7 @@
         <div class="cta-content">
             <h2 class="heading-4"><strong>Serving </strong><span class="text-accent"><strong>Phelps</strong></span></h2>
             <p class="paragraph-4">Call 315-719-1218 or submit the form for a free estimate in Phelps, NY.</p>
-            <a href="/contact/" class="btn btn-primary">Get a Free Estimate</a>
+            <a href="https://bookedin.com/book/lahr-carpet-cleaning-and-upholstery" target="_blank" rel="noopener noreferrer" class="btn btn-primary">Get a Free Estimate</a>
         </div>
     </section>