Update a link

doc/_templates/layout.html

@@ -11,7 +11,7 @@
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   })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-  ga('create', 'UA-20116650-4', 'cppformat.github.io');
+  ga('create', 'UA-20116650-4', 'fmtlib.net');
   ga('send', 'pageview');
 </script>
 {% endblock %}