add GoatCounter analytics, update footer with maintainer credit

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

eurkey-macos.eu/index.html

@@ -125,6 +125,7 @@
 	<!-- FOOTER -->
 	<footer class="footer">
 		<div class="container">
+			<p>EurKEY-macOS maintained by <a href="https://github.com/felixfoertsch">Felix Förtsch</a></p>
 			<p>
 				Based on <a href="https://eurkey.steffen.bruentjen.eu/start.html">EurKEY</a> by Steffen Brüntjen
 				· macOS port originally by <a href="https://github.com/lbschenkel/EurKEY-Mac">Leonardo Brondani Schenkel</a>
@@ -134,5 +135,7 @@
 	</footer>
 
 	<script src="keyboard.js"></script>
+	<script data-goatcounter="https://felixfoertsch.goatcounter.com/count"
+		async src="//gc.zgo.at/count.js"></script>
 </body>
 </html>