feat: lots of refactors and improvements

pages/_app.tsx

@@ -48,20 +48,20 @@ export default function App({ Component, pageProps }) {
   const router = useRouter()
 
   React.useEffect(() => {
+    function onRouteChangeComplete() {
+      Fathom.trackPageview()
+    }
+
     if (fathomId) {
       Fathom.load(fathomId, fathomConfig)
 
-      function onRouteChangeComplete() {
-        Fathom.trackPageview()
-      }
-
       router.events.on('routeChangeComplete', onRouteChangeComplete)
 
       return () => {
         router.events.off('routeChangeComplete', onRouteChangeComplete)
       }
     }
-  }, [])
+  }, [router.events])
 
   return <Component {...pageProps} />
 }