feat: Add hubspot tracking on client page change (#1194)

I had to add a client module that exports a `onRouteDidUpdate` function

clientModule.js

@@ -0,0 +1,13 @@
+// client module for callbacks on route change
+// see https://docusaurus.io/docs/advanced/client#client-module-lifecycles
+export function onRouteDidUpdate({ location, previousLocation }) {
+    // Don't execute if we are still on the same page; the lifecycle may be fired
+    // because the hash changes (e.g. when navigating between headings)
+    if (location.pathname !== previousLocation?.pathname) {
+        // hubspot tracking page view
+        // eslint-disable-next-line no-underscore-dangle, no-multi-assign
+        const _hsq = window._hsq = window._hsq || [];
+        _hsq.push(['setPath', window.location.pathname]);
+        _hsq.push(['trackPageView']);
+    }
+}

docusaurus.config.js

@@ -210,4 +210,5 @@ module.exports = {
             '^/legal/*',
         ],
     },
+    clientModules: ['./clientModule.js'],
 };