Remove duplicate piwik.js to avoid double-tracking

Co-authored-by: tjeerdijk <26492048+tjeerdijk@users.noreply.github.com>

Author: Copilot

docs/source/conf.py

@@ -187,7 +187,7 @@
 html_static_path = ["_static"]
 html_css_files = ["custom.css"]
 # adding custom icons probably only possible with newest pydata theme version
-html_js_files = ["piwik.js", "custom.js"] #, "custom_icon.js"]
+html_js_files = ["custom.js"] #, "custom_icon.js"]
 
 # -- Options for HTMLHelp output ------------------------------------------