Disable Google Analytics tracker for dev and Google PageSpeed bot

src/utils/AnalyticsTracker.svelte

@@ -9,7 +9,10 @@
     const { page } = stores()
 
     // Init Google Analytics
-    if (typeof window !== 'undefined') {
+    if (typeof window !== 'undefined'
+        && process.env.NODE_ENV !== 'development'
+        && navigator.userAgent.indexOf('Speed Insights') == -1
+    ) {
         window.dataLayer = window.dataLayer || []
         window.gtag = function gtag() {
             window.dataLayer.push(arguments)
@@ -23,7 +26,10 @@
 </script>
 
 <svelte:head>
-    {#if process.env.NODE_ENV !== 'development'}
+    {#if
+        process.env.NODE_ENV !== 'development'
+        && navigator.userAgent.indexOf('Speed Insights') == -1
+    }
     <script async src="https://www.googletagmanager.com/gtag/js?id={id}"></script>
     {/if}
 </svelte:head>