Adds goatcounter script

src/components/Header.astro

@@ -4,6 +4,10 @@ import HeaderLogo from "../assets/HeaderLogo.png";
 ---
 
 <header>
+  <script
+    data-goatcounter="https://goatcounter.terakoda.com/count"
+    async
+    src="https://goatcounter.terakoda.com/count.js"></script>
   <nav>
     <div>
       <a href="/">