first commit

media/com_admin/joomla.asset.json

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+{
+  "$schema": "https://developer.joomla.org/schemas/json-schema/web_assets.json",
+  "name": "com_admin",
+  "version": "4.0.0",
+  "description": "Joomla CMS",
+  "license": "GPL-2.0-or-later",
+  "assets": [
+    {
+      "name": "com_admin.admin-help",
+      "type": "script",
+      "uri": "com_admin/admin-help.min.js",
+      "dependencies": [
+        "core"
+      ],
+      "attributes": {
+        "type": "module"
+      },
+      "version": "90c210"
+    }
+  ]
+}

media/com_admin/js/admin-help.js

@@ -0,0 +1,10 @@
+/**
+  * @copyright   (C) 2021 Open Source Matters, Inc. <https://www.joomla.org>
+  * @license     GNU General Public License version 2 or later; see LICENSE.txt
+  */
+const helpIndex = document.getElementById('help-index');
+if (helpIndex) {
+  [].slice.call(helpIndex.querySelectorAll('a')).map(element => element.addEventListener('click', () => {
+    window.scroll(0, 0);
+  }));
+}

media/com_admin/js/admin-help.min.js

@@ -0,0 +1 @@
+const helpIndex=document.getElementById("help-index");helpIndex&&[].slice.call(helpIndex.querySelectorAll("a")).map((e=>e.addEventListener("click",(()=>{window.scroll(0,0)}))));