feat(help): EE-2724 Context sensitive help (#7694)

app/react/components/PageHeader/ContextHelp/ContextHelp.tsx

@@ -0,0 +1,27 @@
+import { HelpCircle } from 'react-feather';
+import clsx from 'clsx';
+
+import { getDocURL } from '@@/PageHeader/ContextHelp/docURLs';
+
+import './ContextHelp.css';
+
+export function ContextHelp() {
+  function onHelpClick() {
+    const docURL = getDocURL();
+    window.open(docURL, '_blank');
+  }
+
+  return (
+    <div
+      className={clsx(
+        'menu-icon',
+        'icon-badge text-lg !p-2 mr-1',
+        'text-gray-8',
+        'th-dark:text-gray-warm-7'
+      )}
+      title="Help"
+    >
+      <HelpCircle className="feather" onClick={onHelpClick} />
+    </div>
+  );
+}