[3.11] Docs: Only include Plausible for html, not for epub etc (GH-107637) (#107643)

Co-authored-by: Hugo van Kemenade <[email protected]>

Author: miss-islington

Doc/tools/templates/layout.html

@@ -26,7 +26,9 @@
 {% endblock %}
 
 {% block extrahead %}
-    <script defer data-domain="docs.python.org" src="https://plausible.io/js/script.js"></script>
+    {% if builder == "html" %}
+      <script defer data-domain="docs.python.org" src="https://plausible.io/js/script.js"></script>
+    {% endif %}
     <link rel="canonical" href="https://docs.python.org/3/{{pagename}}.html" />
     {% if builder != "htmlhelp" %}
       {% if pagename == 'whatsnew/changelog' and not embedded %}