Add DocItem Layout again

src/theme/DocItem/Layout/index.tsx

@@ -0,0 +1,69 @@
+/**
+ * SWIZZLED VERSION: 2.4.1
+ * REASONS:
+ *  - Add custom Banner component.
+ */
+
+import React from 'react';
+import clsx from 'clsx';
+import { useWindowSize } from '@docusaurus/theme-common';
+import { useDoc } from '@docusaurus/theme-common/internal';
+import DocItemPaginator from '@theme/DocItem/Paginator';
+import DocVersionBanner from '@theme/DocVersionBanner';
+import DocVersionBadge from '@theme/DocVersionBadge';
+import DocItemFooter from '@theme/DocItem/Footer';
+import DocItemTOCMobile from '@theme/DocItem/TOC/Mobile';
+import DocItemTOCDesktop from '@theme/DocItem/TOC/Desktop';
+import DocItemContent from '@theme/DocItem/Content';
+import DocBreadcrumbs from '@theme/DocBreadcrumbs';
+import type { Props } from '@theme/DocItem/Layout';
+import DocBanner from '@theme/DocBanner';
+
+import styles from './styles.module.css';
+
+/**
+ * Decide if the toc should be rendered, on mobile or desktop viewports
+ */
+function useDocTOC() {
+  const { frontMatter, toc } = useDoc();
+  const windowSize = useWindowSize();
+
+  const hidden = frontMatter.hide_table_of_contents;
+  const canRender = !hidden && toc.length > 0;
+
+  const mobile = canRender ? <DocItemTOCMobile /> : undefined;
+
+  const desktop =
+    canRender && (windowSize === 'desktop' || windowSize === 'ssr') ? (
+      <DocItemTOCDesktop />
+    ) : undefined;
+
+  return {
+    hidden,
+    mobile,
+    desktop,
+  };
+}
+
+export default function DocItemLayout({ children }: Props): JSX.Element {
+  const docTOC = useDocTOC();
+  return (
+    <div className='row'>
+      <div className={clsx('col', !docTOC.hidden && styles.docItemCol)}>
+        <DocBanner />
+        <DocVersionBanner />
+        <div className={styles.docItemContainer}>
+          <article>
+            <DocBreadcrumbs />
+            <DocVersionBadge />
+            {docTOC.mobile}
+            <DocItemContent>{children}</DocItemContent>
+            <DocItemFooter />
+          </article>
+          <DocItemPaginator />
+        </div>
+      </div>
+      {docTOC.desktop && <div className='col col--3'>{docTOC.desktop}</div>}
+    </div>
+  );
+}

src/theme/DocItem/Layout/styles.module.css

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+.docItemContainer header + *,
+.docItemContainer article > *:first-child {
+  margin-top: 0;
+}
+
+@media (min-width: 997px) {
+  .docItemCol {
+    max-width: 75% !important;
+  }
+}