Remove Google Analytics.

Google shut down the Universal Analytics script that the pages loaded,
and we haven't used it probably a decade

tests/php/Pages/NoAnalyticsTest.php

@@ -0,0 +1,19 @@
+<?php
+namespace Xxx\Tests\Pages;
+
+use Xxx\Tests\Support\PageTestCase;
+
+// The site has no Google Analytics, even with the old GOOGLE_ANALYTICS_ID in the environment
+class NoAnalyticsTest extends PageTestCase {
+  protected static function serverEnv(): array {
+    return array('GOOGLE_ANALYTICS_ID' => 'UA-12345-1');
+  }
+
+  public function testNoPageLoadsAnalytics(): void {
+    foreach (array('/', '/article', '/about', '/publish', '/publish/login') as $path) {
+      $body = $this->get($path)['body'];
+      $this->assertStringNotContainsString('UA-12345-1', $body, $path);
+      $this->assertStringNotContainsString('google-analytics', $body, $path);
+    }
+  }
+}