remove Pirsch experiment

Author: codegaze

_layouts/default.html

@@ -63,9 +63,6 @@
 
         gtag('config', 'G-XEKQBPVNJ4');
       </script>
-      <script defer type="text/javascript" src="https://api.pirsch.io/pirsch.js"
-      id="pirschjs"
-      data-code="CSgRYAMADi1Ynyn0v2gujyqiN0pGFkXq"></script>
     {% endif %}
   </body>
 </html>