docs: Replace GA with self-hosted GC

docs/index.html

@@ -6,6 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta http-equiv="X-UA-Compatible" content="ie=edge">
     <title>Kepubify</title>
+    <link rel="canonical" href="https://pgaskin.net/kepubify/">
     <link rel="stylesheet" href="style.css">
     <meta name="author" content="Patrick Gaskin">
 </head>
@@ -296,14 +297,8 @@
     </div>
     <div class="footer">Copyright 2017-2020 Patrick Gaskin</div>
 
-    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-66226417-1"></script>
-    <script>
-        window.dataLayer = window.dataLayer || [];
-        function gtag(){dataLayer.push(arguments);}
-        gtag('js', new Date());
-        gtag('config', 'UA-66226417-1');
-    </script>
-
+    <script async src="https://pg.gc.geek1011.net/count.js" data-goatcounter="https://pg.gc.geek1011.net/count"></script>
+
     <script>
         var getParameterByName = function (name, url) {
             if (!url) url = window.location.href;