完善 docs

docs/src/theme/DocCard/index.js

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+import React from 'react';
+import Link from '@docusaurus/Link';
+import {findFirstCategoryLink, useDocById} from '@docusaurus/theme-common';
+import clsx from 'clsx';
+import styles from './styles.module.css';
+import isInternalUrl from '@docusaurus/isInternalUrl';
+import {translate} from '@docusaurus/Translate';
+
+function CardContainer({href, children}) {
+  return (
+    <Link
+      href={href}
+      className={clsx('card padding--lg', styles.cardContainer)}>
+      {children}
+    </Link>
+  );
+}
+
+function CardLayout({href, icon, title, description}) {
+  return (
+    <CardContainer href={href}>
+      <h2 className={clsx('text--truncate', styles.cardTitle)} title={title}>
+        {icon} {title}
+      </h2>
+      {description && (
+        <p
+          className={clsx('text--truncate', styles.cardDescription)}
+          title={description}>
+          {description}
+        </p>
+      )}
+    </CardContainer>
+  );
+}
+
+function CardCategory({item}) {
+  const href = findFirstCategoryLink(item); // Unexpected: categories that don't have a link have been filtered upfront
+
+  if (!href) {
+    return null;
+  }
+
+  return (
+    <CardLayout
+      href={href}
+      icon=""
+      title={item.label}
+      description={translate(
+        {
+          message: '{count} items',
+          id: 'theme.docs.DocCard.categoryDescription',
+          description:
+            'The default description for a category card in the generated index about how many items this category includes',
+        },
+        {
+          count: item.items.length,
+        },
+      )}
+    />
+  );
+}
+
+function CardLink({item}) {
+  const doc = useDocById(item.docId ?? undefined);
+  const icon = "";
+  return (
+    <CardLayout
+      href={item.href}
+      icon={icon}
+      title={item.label}
+      description={doc?.description}
+    />
+  );
+}
+
+export default function DocCard({item}) {
+  switch (item.type) {
+    case 'link':
+      return <CardLink item={item} />;
+
+    case 'category':
+      return <CardCategory item={item} />;
+
+    default:
+      throw new Error(`unknown item type ${JSON.stringify(item)}`);
+  }
+}

docs/src/theme/DocCard/styles.module.css

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+.cardContainer {
+  --ifm-link-color: var(--ifm-color-emphasis-800);
+  --ifm-link-hover-color: var(--ifm-color-emphasis-700);
+  --ifm-link-hover-decoration: none;
+
+  box-shadow: 0 1.5px 3px 0 rgb(0 0 0 / 15%);
+  border: 1px solid var(--ifm-color-emphasis-200);
+  transition: all var(--ifm-transition-fast) ease;
+  transition-property: border, box-shadow;
+}
+
+.cardContainer:hover {
+  border-color: var(--ifm-color-primary);
+  box-shadow: 0 3px 6px 0 rgb(0 0 0 / 20%);
+}
+
+.cardContainer *:last-child {
+  margin-bottom: 0;
+}
+
+.cardTitle {
+  font-size: 1.2rem;
+}
+
+.cardDescription {
+  font-size: 0.8rem;
+}