fix(analytics): streamline posthog script loading and event capturing (#1974)

Author: aswwwanth

quartz/plugins/emitters/componentResources.ts

@@ -159,14 +159,10 @@ function addGlobalPageResources(ctx: BuildCtx, componentResources: ComponentReso
       posthog.init('${cfg.analytics.apiKey}', {
         api_host: '${cfg.analytics.host ?? "https://app.posthog.com"}',
         capture_pageview: false,
-      })\`
-      posthogScript.onload = () => {
+      });
+      document.addEventListener('nav', () => {
         posthog.capture('$pageview', { path: location.pathname });
-      
-        document.addEventListener('nav', () => {
-          posthog.capture('$pageview', { path: location.pathname });
-        });
-      };
+      })\`
 
       document.head.appendChild(posthogScript);
     `)