chore: remove GoatCounter analytics from site

GoatCounter domains (goatcounter.com, gc.zgo.at) are blocked by
Hagezi Pro, which is Numa's default blocklist. A DNS privacy tool
should not embed analytics that its own resolver blocks.

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

site/blog-template.html

@@ -298,7 +298,5 @@ $body$
   <a href="/blog/">Blog</a>
 </footer>
 
-<script data-goatcounter="https://razvandimescu.goatcounter.com/count"
-        async src="//gc.zgo.at/count.js"></script>
 </body>
 </html>