docs: Replace plausible by posthog (#2279)

Closes #2278.

Author: thomass-dev

sphinx/_static/js/posthog.js

@@ -77,6 +77,7 @@
 html_js_files = [
     "js/sg_plotly_resize.js",
     "js/reo.js",
+    "js/posthog.js",
 ]
 
 # list of examples in explicit order
@@ -178,14 +179,6 @@
     "navbar_end": ["theme-switcher", "navbar-icon-links"],
 }
 
-# Plausible Analytics
-html_theme_options["analytics"] = {
-    # The domain you'd like to use for this analytics instance
-    "plausible_analytics_domain": domain,
-    # The analytics script that is served by Plausible
-    "plausible_analytics_url": "https://plausible.io/js/script.js",
-}
-
 # Sphinx remove the sidebar from some pages
 html_sidebars = {
     "index": [],