feat(landing): add vs/pagerduty comparison page with FAQ and nav links

- Create /vs comparison page (EN) with Batida vs PagerDuty vs Grafana OnCall
- Create /vs.pt-br comparison page (PT-BR)
- Add FAQ item linking to comparison in both versions
- Add "Compare" nav link in desktop navigation

index.html

@@ -551,6 +551,7 @@
                     <a href="#integrations" class="text-sm hover:text-ember-500 transition-colors" style="color: var(--text-secondary);">Integrations</a>
                     <a href="#pricing" class="text-sm hover:text-ember-500 transition-colors" style="color: var(--text-secondary);">Pricing</a>
                     <a href="#faq" class="text-sm hover:text-ember-500 transition-colors" style="color: var(--text-secondary);">FAQ</a>
+                    <a href="/vs" class="text-sm hover:text-ember-500 transition-colors" style="color: var(--text-secondary);">Compare</a>
                 </div>
                 
                 <!-- Right Side Actions -->
@@ -1626,6 +1627,18 @@
                         Yes. AES-256 encryption, daily backups. LGPD/GDPR compliant. SOC 2 audit in progress.
                     </div>
                 </details>
+
+                <details class="group card-surface rounded-xl overflow-hidden">
+                    <summary class="flex items-center justify-between cursor-pointer px-6 py-5 font-semibold hover:text-ember-500 transition-colors" style="color: var(--text-primary);">
+                        <span>How does Batida compare to PagerDuty?</span>
+                        <svg class="w-5 h-5 flex-shrink-0 ml-4 transition-transform duration-200" style="color: var(--text-muted);" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7"/>
+                        </svg>
+                    </summary>
+                    <div class="px-6 pb-5 leading-relaxed" style="color: var(--text-secondary);">
+                        See our <a href="/vs" style="color: var(--color-primary);">detailed comparison</a> with PagerDuty and Grafana OnCall.
+                    </div>
+                </details>
             </div>
         </div>
     </section>