Fix GoatCounter script URL for Observable Framework build

Changed protocol-relative URL (//gc.zgo.at) to absolute URL (https://gc.zgo.at).
Observable Framework was interpreting the // prefix as a local path.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dshkol

observablehq.config.js

@@ -8,7 +8,7 @@ export default {
   base: "/thedaily",
 
   // GoatCounter analytics
-  head: `<script data-goatcounter="https://dshkol.goatcounter.com/count" async src="//gc.zgo.at/count.js"></script>`,
+  head: `<script data-goatcounter="https://dshkol.goatcounter.com/count" async src="https://gc.zgo.at/count.js"></script>`,
 
   root: "docs",
   output: "dist",