```js
// .storybook/preview.js

import { MDXProvider } from '@mdx-js/react';

import { DocsContainer } from '@storybook/blocks';

import * as DesignSystem from 'your-design-system';

export const MyDocsContainer = (props) => (
  <MDXProvider
    components={{
      h1: DesignSystem.H1,
      h2: DesignSystem.H2,
    }}
  >
    <DocsContainer {...props} />
  </MDXProvider>
);

export const parameters = {
  actions: { argTypesRegex: '^on[A-Z].*' },
  controls: {
    matchers: {
      color: /(background|color)$/i,
      date: /Date$/,
    },
  },
  docs: {
    container: MyDocsContainer,
  },
};
```